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  • General Chemistry  (77,717)
  • Cell & Developmental Biology  (25,032)
  • Seismicity
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  • 1
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    Evolution in unrest processes at Campi Flegrei caldera as inferred from local seismicity (2024)
    Elsevier
    Details
    Publication Date: 2024-01-18
    Description: Changes in seismicity with time and location are diagnostic signals for understanding the dynamics of volcanic unrest. We used these signals at the Campi Flegrei caldera, in southern Italy, to investigate how structural changes have determined three styles of unrest since 1982, distinguished by a ground uplift (measured at Pozzuoli, near the centre of the caldera) of 178 cm in 1982–84; a subsidence of 93 cm in 1985–2005; and an uplift of 118 cm between 2005 and November 2023. Double-difference seismic locations and concentrations of seismic energy release have revealed impermeable horizons that correspond to the cap rock and self-sealed base of the geothermal system at depths of 1.5 and 3 km, respectively. Most earthquakes have been shallower than 3 km, consistent with the brittle upper crust being stretched over a zone of pressurization below the geothermal system. The 1982–84 uplift decayed after a major seismic swarm on April 1st, 1984, breached the lower impermeable horizon, which increased the flux of escaping gas and reduced the source pressure. Continued gas escape promoted subsidence until the lower horizon had resealed itself and initiated a new episode of uplift while gas from depth re-accumulated beneath. Compared with 1982–84, a greater proportion of recent seismicity has occurred at shallower depths below the actively degassing fumaroles of Solfatara-Pisciarelli, north-east of Pozzuoli. The associated high seismic b-values, between 1 and 2, are consistent with high fluid pressures and, hence, with locations more favourable to fracturing. Continued uplift may thus persist until fracturing of the shallow crust allows faster rates of gas release and depressurization of the pressure source.
    Description: Published
    Description: 118530
    Description: OSV2: Complessità dei processi vulcanici: approcci multidisciplinari e multiparametrici
    Description: JCR Journal
    Keywords: Campi Flegrei caldera ; Hydrothermal system ; Volcanic unrest ; Seismicity ; Fluid circulation ; Brittle/ductile transition
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    La rete sismica temporanea FXLand: contribuito al Progetto Fiber Optic Cable Use For Seafloor Studies Of Earthquake - FOCUS (2024)
    INGV
    Details
    Publication Date: 2024-02-12
    Description: Nel 2018 è stato avviato il progetto FOCUS - Fiber Optic Cable Use For Seafloor Studies Of Earthquake - coordinato da Marc-André Gutscher del Laboratoire Géosciences Océan dell’Università di Brest, in Francia. Questo progetto indaga la sismicità e la struttura crostale del Mar Ionio attraverso l’analisi e l’interpretazione di dati raccolti da strumentazione sottomarina e da reti di monitoraggio disponibili o appositamente installate nelle zone di costa. In tale contesto, l’Osservatorio Nazionale Terremoti (ONT) e l’Osservatorio Etneo (OE), entrambe Sezioni dell’Istituto Nazionale di Geofisica e Vulcanologia (INGV), e il Laboratorio di Sismologia dell'Università della Calabria (UniCal), hanno contribuito al progetto con l’installazione di una rete sismica temporanea lungo la costa ionica calabro-siciliana a integrazione della rete permanente presente nell’area dello Stretto di Messina. La rete temporanea, costituita da 13 stazioni, ha acquisito dal mese di dicembre 2021 al mese di giugno 2023. Nel gennaio 2022, i partner internazionali del progetto FOCUS hanno installato una rete temporanea di sismometri OBS e sensori di pressione per fondali marini. La grande quantità di dati raccolta e la loro integrazione, consentirà di migliorare il monitoraggio sismico e le conoscenze relative alla struttura terrestre dell’area con particolare attenzione alle strutture sismogenetiche con un dettaglio mai raggiunto fino a ora. Tutte le istituzioni coinvolte in FOCUS collaborano per l’acquisizione e l’elaborazione dei dati, l’imaging dell’interno della Terra attraverso l’utilizzo di tecniche avanzate, l’interpretazione e la modellazione dei dati. Il presente lavoro descrive la progettazione, la realizzazione e la gestione della rete temporanea a terra definita FXland, fornendo indicazioni relative sul suo generale funzionamento e sulle caratteristiche del dataset acquisito.
    Description: Published
    Description: 1-26
    Description: OST1 Alla ricerca dei Motori Geodinamici
    Description: OST3 Vicino alla faglia
    Description: N/A or not JCR
    Keywords: Progetto FOCUS ; Reti sismiche temporanee ; Sismicità ; FOCUS project ; Temporary seismic networks ; Seismicity ; 04.06. Seismology ; 05.04. Instrumentation and techniques of general interest
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    The AlpArray Research Seismicity-Catalogue (2023)
    Oxford University Press - The Royal Astronomical Society
    Details
    Publication Date: 2023-02-21
    Description: We take advantage of the new large AlpArray Seismic Network (AASN) as part of the AlpArray research initiative (www.alparray.ethz.ch), to establish a consistent seismicity-catalogue for the greater Alpine region (GAR) for the time period 2016 January 1–2019 December 31. We use data from 1103 stations including the AASN backbone composed of 352 permanent and 276 (including 30 OBS) temporary broad-band stations (network code Z3). Although characterized by a moderate seismic hazard, the European Alps and surrounding regions have a higher seismic risk due to the higher concentration of values and people. For these reasons, the GAR seismicity is monitored and routinely reported in catalogues by a 11 national and 2 regional seismic observatories. The heterogeneity of these data set limits the possibility of extracting consistent information by simply merging to investigate the GAR's seismicity as a whole. The uniformly spaced and dense AASN provides, for the first time, a unique opportunity to calculate high-precision hypocentre locations and consistent magnitude estimation with uniformity and equal uncertainty across the GAR. We present a new, multistep, semi-automatic method to process ∼50 TB of seismic signals, combining three different software. We used the SeisComP3 for the initial earthquake detection, a newly developed Python library ADAPT for high-quality re-picking, and the well-established VELEST algorithm both for filtering and final location purposes. Moreover, we computed new local magnitudes based on the final high-precision hypocentre locations and re-evaluation of the amplitude observations. The final catalogue contains 3293 seismic events and is complete down to local magnitude 2.4 and regionally consistent with the magnitude 3+ of national catalogues for the same time period. Despite covering only 4 yr of seismicity, our catalogue evidences the main fault systems and orogens’ front in the region, that are documented as seismically active by the EPOS-EMSC manually revised regional bulletin for the same time period. Additionally, we jointly inverted for a new regional minimum 1-D P-wave velocity model for the GAR and station delays for both permanent station networks and temporary arrays. These results provide the base for a future re-evaluation of the past decades of seismicity, and for the future seismicity, eventually improving seismic-hazard studies in the region. Moreover, we provide a unique, consistent seismic data set fundamental to further investigate this complex and seismically active area. The catalogue, the minimum 1-D P-wave velocity model, and station delays associated are openly shared and distributed with a permanent DOI listed in the data availability section.
    Description: The AlpArray-Switzerland project is funded by the Swiss-AlpArray SINERGIA project CRSII2_154434/1 by Swiss National Science Foundation (SNSF).
    Description: Published
    Description: 921-943
    Description: 1T. Struttura della Terra
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Earthquake source observations ; Seismicity ; Tectonics ; Statistical seismology ; 04.06. Seismology ; 04.01. Earth Interior
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    Kahramanmaraş - Gaziantep Türkiye M7.7 Earthquake, 6 February 2023 (04:17 GMT+03:00) Large historical earthquakes of the earthquake-affected region: a preliminary report (2023)
    Details
    Publication Date: 2023-02-20
    Description: The region where the 2023 February 6 earthquakes took place is known to have been very active in the past; it is part of the contact between the Eurasian and the Arabic plate, an area where seismic activity was relatively low in the 20th century (Figure 1). It is a “border zone” also from the historical point of view; therefore, although many earthquakes are known to most earthquake catalogues and compilations, the relevant information is often rather poor and affected by chronological and place-names problems. As a consequence, earthquake parameters given in the catalogues are often based on a poor dataset; the situation is even more complicated by chronological issues and careless compilations, which lead to earthquake duplications. In the frame of a larger investigation effort underway (Sesetyan et al., 2020; Stucchi et al. 2022) we first considered the available information from the main earthquake catalogues and compilations in the time-window 1000-1900. The volume by Ambraseys (2009) summarizes and sometimes updates the knowledge already proposed in previous works such as Ambraseys and Jackson (1988), Ambraseys (1989), Ambraseys and Finkel (1995). We also considered the works by Soysal et al. (1981), Guidoboni et al. (2019), Sbeinati et al. (2005), some recent historical earthquake investigations and the parametric catalogues by Shebalin and Tatevossian (1997), Tan et al. (2008), Sesetyan et al. (2013). Next, we assessed - when possible - macroseismic intensities at the mentioned localities and, from them, we assessed earthquake parameters by making use of the so-called “Boxer” method by Gasperini et al. (1999). For some of the main earthquakes in the region we briefly summarise here the earthquake parameters from our investigation and from the main catalogues. In the Appendix we summarise the available information.
    Description: Boğaziçi University Kandilli Observatory and Earthquake Research Institute Department of Earthquake Engineering, Istanbul (Turkey) Istituto Nazionale di Geofisica e Vulcanologia, Italia
    Description: Published
    Description: 3T. Fisica dei terremoti e Sorgente Sismica
    Keywords: Turkey ; Eastern Anatolian Fault ; Seismic History ; Kahramanmaraş - Gaziantep Türkiye M7.7 Earthquake, 6 February 2023 ; Large Historical Earthquakes ; Anatolia ; Historical Seismology ; Seismicity ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 5
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    FocusX temporary land-network (FXland), seismic data and preliminary analysis (2023)
    Details
    Publication Date: 2023-05-19
    Description: In the frame of FocusX2 project INGV (Osservatorio Nazionale Terremoti and Osservatorio Etneo) and UniCal (Laboratorio di Sismologia) are deploying, from the end of 2021 to January 2023 a temporary seismic network for an active/passive seismological experiment to record regional and global seismicity in the Ionian Sea. The goal of this experiment is to improve the detection of seismicity in the Ionian Sea area and the accuracy of the locations; to better define the crustal structure of the region and find patterns related to fault systems. The seismicity in the area is possibly the result of two types of tectonic activity at different depths: a gently NW dipping subduction interface of the Calabrian subduction zone, and the strike-slip fault systems in the Ionian Sea, well expressed in the morpho-bathymetry and observed in previous seismic profiles. The deployment of 13 temporary land stations, FocusX temporary land (network code 1J) https://doi.org/10.13127/SD/O5QWM6WJCD along the coasts of eastern Sicily and SW Calabria, is going to complement the permanent networks (network codes IV, MN and IY); in the same period OBS stations are deployed at sea: FocusX temporary OBS-network (network code XH). The land stations are equipped with two different type of digitizers: Reftek 130 (12), and SaraSL06 (2); and with three different type of velocimeters: Trillium 120C (10), Le 5s (2) and ss08 60s (2). Continuous data are transmitted in real time at the INGV Rome acquisition system, used in the seismic surveillance, archived and distributed in EIDA https://eida.ingv.it/it/. In the deployment period 23rd December 2021 - 9th May 2022 regional seismicity (area between Lat 36.5-38.2 Lon 14.5-16.0) include 390 events located by the INGV seismic surveillance system, two of them with magnitude larger than 4.0 as well as 56 teleseismic earthquakes with magnitude larger than magnitude 6.0, two of them larger than 7.0. The two local events with M〉4.0 and some of their aftershocks, were analyzed by the analysts of the Italian Seismic Bulletin including all the stations of the FXland 1J network.
    Description: Published
    Description: Catania
    Description: 4T. Sismicità dell'Italia
    Keywords: Seismic network ; Seismicity ; deep structure ; Ionian Sea ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 6
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    Quantification of bone surface textures: exploring a new method of ontogenetic ageing (2023)
    In:  Journal of Analytical Science and Technology vol. 14 no. 1
    Details
    Publication Date: 2024-02-26
    Description: Identifcation of ontogenetic age classes plays an important role in the felds of zoology, palaeontology and archaeology, where accurate age classifcations of (sub)fossil remains are a crucial component for the reconstruction \nof past life. Textural ageing\xe2\x80\x94the identifcation of age-related bone surface textures\xe2\x80\x94provides a size-independent \nmethod for age assessment of vertebrate material. However, most of the work so far is limited to qualitative results. \nWhile qualitative approaches provide helpful insights on textural ageing patterns, they are heavily subject to observer \nbias and fall short of quantitative data relevant for detailed statistical analyses and cross-comparisons. Here, we present a pilot study on the application of 3D surface digital microscopy to quantify bone surface textures on the long \nbones of the grey heron (Ardea cinerea) and the Canada goose (Branta canadensis) using internationally verifed \nroughness parameters. Using a standardised measuring protocol, computed roughness values show a strong correlation with qualitative descriptions of textural patterns. Overall, higher roughness values correspond to increased numbers of grooves and pits and vice versa. Most of the roughness parameters allowed distinguishing between diferent \nontogenetic classes and closely followed the typical sigmoidal animal growth curve. Our results show that bone \ntexture quantifcation is a feasible approach to identifying ontogenetic age classes.
    Keywords: General Physics and Astronomy ; General Environmental Science ; General Biochemistry ; Genetics and Molecular Biology ; General Materials Science ; General Chemistry ; Roughness ; Surfaces ; Taphonomy ; Topography ; Bone ; Ontogeny ; Digital microscopy
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 7
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    Earthquakes in Switzerland and surrounding regions during 2017 and 2018 (2021)
    Springer
    Details
    Publication Date: 2021-02-12
    Description: This report summarizes the seismicity in Switzerland and surrounding regions in the years 2017 and 2018. In 2017 and 2018, the Swiss Seismological Service detected and located 1227 and 955 earthquakes in the region under considera- tion, respectively. The strongest event in the analysed period was the ML 4.6 Urnerboden earthquake, which occurred in the border region of cantons Uri, Glarus and Schwyz on March 6, 2017. The event was the strongest earthquake within Switzerland since the ML 5.0 Vaz earthquake of 1991. Associated ground motions indicating intensity IV were reported in a radius up to about 50 km and locally approached intensity VI in the region close to the epicentre. Derived focal mechanisms and relative hypocentre relocations of the immediate aftershocks image a NNW–SSE striking sinistral strike-slip fault. Together with other past events in this region, the Urnerboden earthquake suggests the existence of a system of sub-parallel strike-slip faults, likely within in the uppermost crystalline basement of the eastern Aar Massif. A vigorous earthquake sequence occurred close to Château-d’Oex in the Préalpes-Romandes region in western Switzer- land. With a magnitude of ML 4.3, the strongest earthquake of the sequence occurred on July 1, 2017. Focal mechanism and relative relocations of fore- and aftershocks image a NNE dipping normal fault in about 4 km depth. Two similarly oriented shallow normal-fault events occurred between subalpine Molasse and Préalpes units close to Châtel-St-Denis and St. Silvester in 2017/18. Together, these events indicate a domain of NE–SW oriented extensional to transtensional deformation along the Alpine Front between Lake Geneva in the west and the Fribourg Fault in the east. The structural complexity of the Fribourg Fault is revealed by an ML 2.9 earthquake near Tafers in 2018. The event images a NW–SE striking fault segment within the crystalline basement, which might be related to the Fribourg Fault Zone. Finally, the ML 2.8 Grenchen earthquake of 2017 provides a rare example of shallow thrust faulting along the Jura fold-and-thrust belt, indicating contraction in the northwestern Alpine foreland of Switzerland.
    Description: Published
    Description: id 4
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Seismicity ; Focal mechanisms ; Seismotectonics ; Urnerboden ; Aar Massif ; Château-d’oex ; Préalpes ; Fribourg ; Jura fold-and-thrust belt ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 8
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    Seismic and Geodetic Crustal Moment-Rates Comparison: New Insights on the Seismic Hazard of Egypt (2021)
    MDPI
    Details
    Publication Date: 2021-12-23
    Description: A comparative analysis of geodetic versus seismic moment-rate estimations makes it possible to distinguish between seismic and aseismic deformation, define the style of deformation, and also to reveal potential seismic gaps. This analysis has been performed for Egypt where the present-day tectonics and seismicity result from the long-lasting interaction between the Nubian, Eurasian, and Arabian plates. The data used comprises all available geological and tectonic information, an updated Poissonian earthquake catalog (2200 B.C.–2020 A.D.) including historical and instrumental datasets, a focal-mechanism solutions catalog (1951–2019), and crustal geodetic strains from Global Navigation Satellite System (GNSS) data. The studied region was divided into ten (EG-01 to EG-10) crustal seismic sources based mainly on seismicity, focal mechanisms, and geodetic strain characteristics. The delimited seismic sources cover the Gulf of Aqaba–Dead Sea Transform Fault system, the Gulf of Suez–Red Sea Rift, besides some potential seismic active regions along the Nile River and its delta. For each seismic source, the estimation of seismic and geodetic moment-rates has been performed. Although the obtained results cannot be considered to be definitive, among the delimited sources, four of them (EG-05, EG-06, EG-08, and EG-10) are characterized by low seismic-geodetic moment-rate ratios (〈20%), reflecting a prevailing aseismic behavior. Intermediate moment-rate ratios (from 20% to 60%) have been obtained in four additional zones (EG-01, EG-04, EG-07, and EG-09), evidencing how the seismicity accounts for a minor to a moderate fraction of the total deformational budget. In the other two sources (EG-02 and EG-03), high seismic-geodetic moment-rates ratios (〉60%) have been observed, reflecting a fully seismic deformation
    Description: This research has been partially funded in the frame of the Programa Operativo FEDER Andalucía 2014–2020-call made by the University of Jaén, 2018.
    Description: Published
    Description: 7836
    Description: 2T. Deformazione crostale attiva
    Description: JCR Journal
    Keywords: Seismicity ; GNSS ; Strain ; seismic hazard ; Egypt ; 04. Solid Earth ; 04.03. Geodesy ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    La sismicità storica dell'isola senza terremoti (2020)
    INGV
    Details
    Publication Date: 2020-12-18
    Description: probably confirm this opinion, with qualifica ons. Historical earthquake catalogues, up to CPTI11 [Rovida et al., 2011], report only one Mw 5.1 event on 13 November 1948: it was located in the Sardinian Sea, and had very modest effects on land. In later decades, the seismic networks did record very few earthquakes of moderate energy (Mw 〈5), mostly located off-shore, either south-east of Cagliari or west of Olbia or in the Sea of Sardinia. The most recent ones (occurred in 2000, 2004 and 2006) had very slight effects on the island. Given the low level of instrumental seismicity and the weak macroseismic effects of known historical earthquakes, Sardinia's seismic risk is perceived as very low. The low seismicity of the region certainly has a geological explana on, given that the Corsica-Sardinia block is among the most stable areas of the Mediterranean basin. “Low”, however, does not mean “non- existent”: recent historical research has improved knowledge on the major known historical earthquake of Sardinia (it occurred on June 4, 1616 and was responsible for minor but widespread damage to the system of coastal watchtowers, south-west of Cagliari) and rediscovered several minor earthquakes, part of which were known to the seismological tradi on but had been almost completely forgo en. This paper collects all the documenta on available at present on the seismic history of Sardinia.
    Description: Published
    Description: 1-160
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Sardinia ; Seismicity ; Seismic history ; Historical Earthquakes ; Historical seismology ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 10
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    From mapped faults to fault-length earthquake magnitude (FLEM): a test on Italy with methodological implications (2020)
    Details
    Publication Date: 2020-12-15
    Description: Empirical scaling relationships between fault or slip dimensions and earthquake magnitudes are often used to assess the maximum possible earthquake magnitude of a territory. Upon the assumption of the reactivability of any fault, the earthquake magnitudes derived from the surface fault length (FLEM) are compared at the national scale in Italy against catalogued magnitudes. FLEMs are obtained by considering a comprehensive fault dataset regardless of fault age, stress field orientation, strain rate, etc. In particular, (1) a comprehensive catalogue of all known faults is compiled by merging the most complete databases available; (2) FLEM is then derived from fault length; and (3) the resulting FLEMs are compared (i.e. the mathematical difference) with catalogued earthquake magnitudes. Results show that the largest FLEMs as well as the largest differences between FLEMs and catalogued magnitudes are observed for poorly constrained faults, mainly inferred from subsurface data. It is suggested that these areas have to be further characterized to better estimate fault dimension and segmentation and hence properly assess the FLEM. Where, in contrast, the knowledge of faults is geologically well constrained, the calculated FLEM is often consistent with the catalogued seismicity, with the 2 value of the distribution of differences being 1.47 and reducing to 0.53 when considering only the Mw 6:5 earthquakes. Our work highlights areas, in Italy, where further detailed studies on faults are required.
    Description: Published
    Description: 1555–1579
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Italy ; Seismicity ; Itaalian seismicity
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 11
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    How well does known seismicity between the Lower Rhine Graben and southern North Sea reflect future earthquake activity? (2020)
    Details
    Publication Date: 2021-03-29
    Description: Since the 14th century, moderate seismic activity with 14 earthquakes of magnitude MW≥5.0 occurred in Western Europe in a region extending from the Lower Rhine Graben (LRG) to the southern North Sea. In this paper, we investigate how well this seismic activity could reflect that of the future. The observed earthquake activity in the LRG is continuous and concentrates on the Quaternary normal faults delimiting the LRG, which are also the source of large surface rupturing Holocene and Late Pleistocene earthquakes. The estimated magnitudes of these past earthquakes range from 6.3±0.3 to 7.0±0.3 while their average recurrence on individual faults varies from ten thousand to a few ten thousand years, which makes foreseeing future activity over the long-term possible. Three of the largest historical earthquakes with MW≥5.5 occurred outside the LRG. Late Quaternary activity along the fault zones suspected to be the source of two of these earthquakes, i.e. the 1580 Strait of Dover and 1692 northern Belgian Ardennes earthquakes, is very elusive if it exists. Hence, similar earthquakes would be very infrequent at these locations suggesting that the seismicity outside of the LRG would be episodic and clustered on some faults during periods of a few hundreds of years interrupted by long periods of inactivity typically lasting for some tens to hundreds of thousand years. Seismic moment release estimation and its comparison between recent geological and historical seismicity periods lead us to suggest that the high seismicity level observed between AD 1350 and AD 1700 west of the LRG would be uncommon.
    Description: research
    Keywords: 551.22 ; 550 ; e-docs::Geophysik ; Seismicity ; Earthquake ; Fault zone ; Historical earthquake ; Holocene ; FID-GEO-DE-7
    Language: English
    Type: article_first
    Format: 20
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  • 12
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    Seiscloud, a tool for density-based seismicity clustering and visualization (2020)
    Springer Netherlands
    Details
    Publication Date: 2023-06-09
    Description: Clustering algorithms can be applied to seismic catalogs to automatically classify earthquakes upon the similarity of their attributes, in order to extract information on seismicity processes and faulting patterns out of large seismic datasets. We describe here a Python open-source software for density-based clustering of seismicity named seiscloud, based on the pyrocko library for seismology. Seiscloud is a tool to dig data out of large local, regional, or global seismic catalogs and to automatically recognize seismicity clusters, characterized by similar features, such as epicentral or hypocentral locations, origin times, focal mechanisms, or moment tensors. Alternatively, the code can rely on user-provided distance matrices to identify clusters of events sharing indirect features, such as similar waveforms. The code can either process local seismic catalogs or download selected subsets of seismic catalogs, accessing different global seismicity catalog providers, perform the seismic clustering over different steps in a flexible, easily adaptable approach, and provide results in form of declustered seismic catalogs and a number of illustrative figures. Here, the algorithm usage is explained and discussed through an application to Northern Chile seismicity.
    Description: Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum - GFZ (4217)
    Keywords: ddc:551.22 ; Seismicity ; Clustering ; Location ; Moment tensor
    Language: English
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  • 13
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    Seismicity in the Northern Rhine Area (1995–2018) (2020)
    Springer Netherlands
    Details
    Publication Date: 2023-06-09
    Description: Since the mid-1990s, the local seismic network of the University of Cologne has produced digital seismograms. The data all underwent a daily routine processing. For this study, we re-processed data of almost a quarter century of seismicity in the Northern Rhine Area (NRA), including the Lower Rhine Embayment (LRE) and the Eifel Mountain region (EMR). This effort included refined discrimination between tectonic earthquakes, mine-induced events, and quarry blasts. While routine processing comprised the determination of local magnitude ML, in the course of this study, source spectra-based estimates for moment magnitude MW for 1332 earthquakes were calculated. The resulting relation between ML and MW agrees well with the theory of an ML ∝ 1.5 MW dependency at magnitudes below 3. By applying Gutenberg-Richter relation, the b-value for ML was less (0.82) than MW (1.03). Fault plane solutions for 66 earthquakes confirm the previously published N118° E direction of maximum horizontal stress in the NRA. Comparison of the seismicity with recently published Global Positioning System–based deformation data of the crust shows that the largest seismic activity during the observation period in the LRE occurred in the region with the highest dilatation rates. The stress directions agree well with the trend of major faults, and declining seismicity from south to north correlates with decreasing strain rates. In the EMR, earthquakes concentrate at the fringes of the area with corresponding the largest uplift.
    Description: Projekt DEAL
    Keywords: ddc:551.22 ; Northern Rhine Area ; Lower Rhine Embayment ; Eifel ; Seismicity ; Moment magnitude ; Crustal deformation
    Language: English
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  • 14
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    Earthquakes in Switzerland and surrounding regions during 2015 and 2016 (2019)
    Details
    Publication Date: 2020-12-07
    Description: This report summarizes the seismicity in Switzerland and surrounding regions in the years 2015 and 2016. In 2015, the Swiss Seismological Service detected and located 735 earthquakes in the region under consideration. With a total of 20 earthquakes of magnitude ML C 2.5, the seismic activity of potentially felt events in 2015 was close to the average of 23 earthquakes over the previous 40 years. Seismic activity was above average in 2016 with 872 located earthquakes of which 31 events had ML C 2.5. The strongest event in the analyzed period was the ML 4.1 Salgesch earthquake, which occurred northeast of Sierre (VS) in October 2016. The event was felt in large parts of Switzerland and had a maximum intensity of V. Derived focal mechanisms and relative hypocenter relocations of aftershocks image a SSE dipping reverse fault, which likely also hosted an ML 3.9 earthquake in 2003. Another remarkable earthquake sequence in the Valais occurred close to Sion with four felt events (ML 2.7–3.2) in 2015/16. We associate this sequence with a system of WNW-ESE striking fault segments north of the Rhoˆne valley. Similarities with a sequence in 2011, which was located about 10 km to the NE, suggest the existence of an en-echelon system of basement faults accommodating dextral slip along the Rhoˆne-Simplon line in this area. Another exceptional earthquake sequence occurred close to Singen (Germany) in November 2016. Relocated hypocenters and focal mechanisms image a SW dipping transtensional fault segment, which is likely associated with a branch of the Hegau-Bodensee Graben. On the western boundary of this graben, micro-earthquakes close to Schlattingen (TG) in 2015/16 are possibly related to a NE dipping branch of the Neuhausen Fault. Other cases of earthquakes felt by the public during 2015/16 include earthquakes in the region of Biel, Vallorcine, Solothurn, and Savognin.
    Description: SwissEnergy (http:// www.energieschweiz.ch) and the Swiss Federal Office of Energy for the financial support of project GEOBEST-CH; Swiss Competence Center for Energy Research—Supply of Electricity (http://www.sccer-soe.ch); Swiss-AlpArray SINERGIA project CRSII2_154434/1 by the Swiss National Science Foundation (SNSF)
    Description: Published
    Description: 221–244
    Description: 2T. Sorgente Sismica
    Description: 1IT. Reti di monitoraggio
    Description: 5IT. Osservatori
    Description: JCR Journal
    Keywords: Seismicity ; Magnitude of completeness ; Focal mechanisms ; Seismotectonics ; Rhone-Simplon line ; Hegau-Bodensee graben ; Basel ; Aar massif ; 04. Solid Earth ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 15
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    A Complete Automatic Procedure to Compile Reliable Seismic Catalogs and Travel‐Time and Strong‐Motion Parameters Datasets (2019)
    Details
    Publication Date: 2021-02-26
    Description: The compilation of reliable and complete seismic catalogs represents a fundamental issue for most studies in seismology. Nowadays, the availability of an ever-increasing number of stations and, therefore, the huge amount of recordings to be processed and analyzed require a lot of effort in terms of man-hours. In the present work, we present a fully automatic procedure for compiling seismic catalogs starting from continuous recordings. The procedure relies on a multistep algorithm that includes event detection tool, automatic P- and S-phase picker, hypocenter locator, and magnitude and strong-motion parameter calculator. This automatic procedure is applied for compiling seismic catalogs for two real-world usage scenarios starting from the openaccess waveform database provided by European Integrated Data Archive. The first scenario concerns the monitoring of the seismicity of northwestern Italy; the second one concerns the analysis of the data recorded during the first month of the 2016 sequence in central Italy. The comparison between reference manually revised and automatic seismic catalogs points out negligible differences in terms of both P- and S-phase pickings, hypocentral coordinates, and local magnitude values, thus showing the overall reliability of the procedure. The ability of the proposed automatic procedure in detecting and locating very low-magnitude events is prominent to compile automatic catalogs characterized by a magnitude of completeness significantly lower than that of reference manual catalogs.
    Description: Published
    Description: 1308-1317
    Description: 8T. Sismologia in tempo reale
    Description: JCR Journal
    Keywords: Seismicity ; Seismic Catalogue ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 16
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    Unknown
    The Seismicity of Ischia Island (2019)
    Details
    Publication Date: 2021-03-09
    Description: Ischia is a volcanic island, west of the caldera of Campi Flegrei, southern Italy. Since the deployment of a modern seismic network in 1970, until the 21 August 2017 earthquake, the seismicity of Ischia has been characterized by low-magnitude (Md ≤ 2:3) earthquakes located in the northern part of the island, mostly beneath the town of Casamicciola Terme at very shallow depths (∼500 m). Some of these events seem to have occurred on the same seismogenetic structure in the northern part of the island. This area coincides with that where the devastating events of 1881 and 1883 occurred and where the small-magnitude seismicity recorded between 1927 and 1936 was located. The August 2017 seismic sequence affected the same area. The current network configuration is able to locate shallow events with Md ≥ 1:0 and to detect smaller earthquakes or other types of natural and artificial events (e.g., blast fishing, geothermal well explosions; see The Seismic Network section). Here, we present the catalog of earthquakes recorded on Ischia between 1999 and February 2018 and compare the August 2017 seismic sequence with the background seismicity. Furthermore, we identified a sequence of events possibly linked to the explosion of a geothermal well on the island.
    Description: This work benefited of the project “Sale operative integrate e reti di monitoraggio del futuro: l’INGV 2.0,” Fondo integrativo speciale per la ricerca (FISR) anni 2016 e 2017 (Delibera n. 78/2017). Furthermore, this work benefited of the agreement between Istituto Nazionale di Geofisica e Vulcanologia and Italian Department of Civil Protection (DPC).
    Description: Published
    Description: 1750-1760
    Description: 6V. Pericolosità vulcanica e contributi alla stima del rischio
    Description: JCR Journal
    Keywords: Ischia ; Seismic Network ; Seismicity
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 17
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    Unknown
    Journal of Geophysics - Zeitschrift für Geophysik 55 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 31 Artikel zu Themengebieten der Geophysik, inklusive einer Ausgabe zur "Internationalen Magnetosphären Studie" und einer Ausgabe "Elektromagnetik", veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1984.
    Description: Inhaltsverzeichnis: Journal of Geophysics 55 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0011.pdf"〉Seismicity and dynamics of the Upper Rhinegraben〈/a〉〈br〉 (Bonjer, K.-P., Gelbke, C., Gilg, B., Rouland, D., Mayer-Rosa, D., Massinon, B.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0012.pdf"〉The crustal structure of the southern Rhinegraben from re-interpretation of seismic refraction data〈/a〉〈br〉 (Zuccu, J. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0013.pdf"〉On the identification of a transition zone in electrical conductivity between the lithosphere and asthenosphere: a plea for more precise phase data〈/a〉〈br〉(Cavaliere, T., Jones, A. G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0014.pdf"〉The influence of geomagnetic variations on pipelines and an application for large-scale magnetotelluric depth sounding〈/a〉〈br〉 (Brasse, H., Junge, A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0015.pdf"〉Some characteristics of the horizontal field variations around the geomagnetic jerk of 1970〈/a〉〈br〉 (Nevanlinna, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0016.pdf"〉Ground-based observations of a very intense substorm-related pulsation event〈/a〉〈br〉 (Lühr, H., Klöcker, N., Thürey, S.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0018.pdf"〉Dreidimensionale Seismik in der Exploration auf Kohlenwasserstoff-Lagerstätten〈/a〉〈br〉 (Dürschner, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0019.pdf"〉Long-term variations recorded by extensometers〈/a〉〈br〉 (Varga, P.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0020.pdf"〉Book reviews〈/a〉〈br〉 (Schneider, G., Jentzsch, G., Schick, R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0021.pdf"〉Preface to the special issue ”Sixt Workshop on IMS observations in Northern Europe” held in Cumberland Logde, Windsor from 16-20 May 1983〈/a〉〈br〉 (Orr, D., Untiedt, J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0022.pdf"〉Magnetospheric hydromagnetic waves: their eigenperiods, amplitudes and phase variations; a tutorial introduction〈/a〉〈br〉(Orr, D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0023.pdf"〉ELF intensity levels at geostationary orbit and pulsating aurora〈/a〉〈br〉 (Ward, I. A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0024.pdf"〉Ground observations of geomagnetic pulsations during a quiet magnetospheric interval correlated with satellite plasma measurements〈/a〉〈br〉 (Gough, H., Orr, D., Wedeken, U.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0025.pdf"〉Period, phase and resonant structure of a pulsation event seen by the ISEE 1 and 2 spacecraft on 2–3 April 1978〈/a〉〈br〉(Gardner, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0026.pdf"〉Pc5 pulsations and their possible source mechanisms: a case study〈/a〉〈br〉(Glaßmeier, K., Lester, M., Mier-Jedrzejowicz, W., Green, C., Rostoker, G., Orr, D., Wedeken, U., Junginger, H., Amata, E.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0027.pdf"〉Ground-satellite coordinated study of the April 5, 1979 events: flux variations of energetic particles and associated magnetic pulsations〈/a〉〈br〉(Wedeken, U., Inhester, B., Korth, A., Glaßmeier, K., Gendrin, R., Lanzerotti, L., Gough, H., Green, C., Amata, E., Pedersen, A., Rostoker, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0028.pdf"〉Ground-satellite coordinated study of the April 5, 1979 events: observation of O〈sup〉+〈/sup〉 cyclotron waves〈/a〉〈br〉(Inhester, B., Wedeken, U., Korth, A., Perraut, S., Stokholm, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0029.pdf"〉Preface to an “electromagnetic issue” initiated by a symposium of IAGA Working Group I-3 on August 23, 1983, during the IUGG General assembly in Hamburg〈/a〉〈br〉(Haak, V.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0030.pdf"〉Deep electromagnetic studies of the Baltic Shield〈/a〉〈br〉(Hjelt, S.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0031.pdf"〉Magnetometer array studies in Finland – determination of single station transfer functions〈/a〉〈br〉(Pajunpää, K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0032.pdf"〉Models of geoelectrical anomalies in Czechoslovakia〈/a〉〈br〉(Červ, V., Pek, J., Praus, O.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0033.pdf"〉The electrical conductivity of the Andean crust in northern Chile and southern Bolivia as inferred from magnetotelluric measurements〈/a〉〈br〉(Schwarz, G., Haak, V., Martínez, E., Bannister, J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0034.pdf"〉Electrical conductivity of the asthenosphere〈/a〉〈br〉(Vanyan, L.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0035.pdf"〉A high conductivity anomaly on the West African craton (Mali)〈/a〉〈br〉(Ritz, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0036.pdf"〉Search for a possible electromagnetic coupling between a transatlantic communication cable and the magma chamber in the mid-Atlantic ridge〈/a〉〈br〉(Meloni, A., Gregori, G., Lanzerotti, L., Medford, L.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0038.pdf"〉A new pulsed audiomagnetotelluric technique〈/a〉〈br〉(Schnegg, P.-A., Fischer, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0039.pdf"〉Preliminary results of MHD test registrations in northern Finland〈/a〉〈br〉(Heikka, J., Zhamaletdinov, A., Hjelt, S., Demidova, T., Velikhov, Y.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0040.pdf"〉Bimodal induction in non-uniform thin sheets: do the present algorithms work for regional studies?〈/a〉〈br〉(Mareschal, M., Vasseur, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0041.pdf"〉Solution of the stationary approximation for MT fields in the layered Earth with 3D and 2D inhomogeneities〈/a〉〈br〉(Hvoždara, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0042.pdf"〉Analogue-model magnetic field responses of an ocean channel, an island and a seamount in the Hainan Island region〈/a〉〈br〉(Hu, W. B., Dosso, H. W., Nienaber, W.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0055/LOG_0043.pdf"〉Conductivity modellling of the Earth using solar and lunar daily magnetic variations〈/a〉〈br〉(Winch, D. E.)〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DGG, DFG, SUB Göttingen
    Keywords: 550 ; Geophysik ; Africa ; Asthenosphere ; Aurora ; Baltic Shield ; China ; Czechoslovakia ; Earth’s Crust ; ELAS project ; Electrojets ; Electromagnetic Induction ; ELF waves ; Exploration Seismics ; Geomagnetic Induction Studies ; Geomagnetic Pulsations ; Geomagnetic Secular Variation ; Geomagnetic Variations ; Hydromagnetic Waves ; Ion Cyclotron Waves ; Magnetometer Arrays ; Magnetospheric Plasma ; Magnetotellurics ; MHD generator ; Pipelines ; Refraction Seismology ; Rhinegraben ; Satellite Observations ; Seismicity ; South America ; Transatlantic Cable ; FID-GEO-DE-7
    Language: German , English
    Type: anthology_digi
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  • 18
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    Journal of Geophysics - Zeitschrift für Geophysik 45 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:45
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 44 Artikel zu Themengebieten der Seismologie, Erdmagnetismus und Gesteinsphysik veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1978.
    Description: Inhaltsverzeichnis: Journal of Geophysics 45 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0010.pdf"〉Magnetotelluric investigation of the lower crust and upper mantle Beneath Iceland〈/a〉〈br〉 (Beblo, M., Björnsson, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0011.pdf"〉Damped and constrained least squares method with application to gravity interpretation〈/a〉〈br〉 (Vigneresse, J. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0012.pdf"〉Reappraisal of palaeomagnetism of the Colli Euganei and Monti Lessini Volcanics (Italy) 〈/a〉〈br〉 (Channell, J. E. T., De Zanche, V., Sedea, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0013.pdf"〉Reinterpretation of palaeomagnetism of the Colli Euganei and Monti Lessini (Italy) 〈/a〉〈br〉 (Soffel, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0014.pdf"〉Observations of the initial develpopment of an auroral and magnetic substorm at magnetic midnight〈/a〉〈br〉 (Untiedt, J., Pellinen, R., Küppers, F., Opgenoorth, H. J., Pelster, W. D., Baumjohann, W., Ranta, H., Kangas, J., Czechowsky, P., Heikkila, W. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0015.pdf"〉Ionospheric observation of gravity-waves associated with hurricane Eloise〈/a〉〈br〉 (Hung, R.J., Kuo, J. P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0016.pdf"〉On the annual wave of hemispheric geomagnetic activity〈/a〉〈br〉 (Damaske, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0017.pdf"〉Solar electron fluxes, increased geomagnetic activity and ionospheric absorption following selected flares〈/a〉〈br〉 (Märcz, F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0018.pdf"〉The H amplitude of sudden commencements of magnetic storms at Sabhawala (Dehra Dun) 〈/a〉〈br〉 (Jain, A. R., Sastri, N. S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0019.pdf"〉Crustal structure of the Reykjanes Ridge at 63° N derived from seismic measurements〈/a〉〈br〉 (Snoek, M., Goldflam, S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0020.pdf"〉Book review〈/a〉〈br〉 (Strobach, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0021.pdf"〉Electron density in the South Atlantic anomaly region〈/a〉〈br〉 (Noor Sheikh, M., Rawer, K., Neske, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0023.pdf"〉Inversion of satellite magnetic anomaly data〈/a〉〈br〉 (Mayhew, M. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0026.pdf"〉The effect of earth structure on radial oscillations〈/a〉〈br〉 (Wang, C., Cleary, J. R., Anderssen, R. S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0027.pdf"〉Relationship between the seismic quality factor Q and the effective viscosity η〈/a〉〈br〉 (Meissner, R. O., Vetter, U. R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0028.pdf"〉The wave field associated with a fine structured moho in continents and oceans〈/a〉〈br〉 (Kosminskaya, I. P., Kapustian, N. K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0029.pdf"〉Tidal triggering of earthquakes in the Swabian jura? 〈/a〉〈br〉 (Young, D., Zürn, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0030.pdf"〉Theoretical investigations on acoustic remote sensing of ocean surface waves〈/a〉〈br〉 (Essen, H.-H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0031.pdf"〉A comparison of results of geothermal and magnetotelluric investigations in northwestern Germany〈/a〉〈br〉 (Knödel, K., Losecke, W., Wohlenberg, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0032.pdf"〉Effect of the coastline configuration of south Indian and Sri Lanka regions on the induced field at short period〈/a〉〈br〉 (Takeda, M., Maeda, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0034.pdf"〉Correction of graphs concerning the Chapman-Ferraro image method〈/a〉〈br〉 (Burkard, O. M., Rucker, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0036.pdf"〉On the difference between polarisation and coherence〈/a〉〈br〉 (Jones, A. G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0037.pdf"〉Palaeosecular variation studies of the Brunhes epoch in the volcanic province of the East-Eifel, Germany〈/a〉〈br〉 (Kohnen, H., Westkämper, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0038.pdf"〉Book review〈/a〉〈br〉 (Vees, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0039.pdf"〉Sixth annual meeting of the European Geophysical Society〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0040.pdf"〉Partial self-reversal of natural remanent magnetization of an historical lava flow of Mt. Etna (Sicily) 〈/a〉〈br〉 (Heller, F., Markert, H., Schmidbauer, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0044.pdf"〉Palaeomagnetic study of the tertiary volcanics of Sardinia〈/a〉〈br〉 (Edel, J.-B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0046.pdf"〉Analysis of an eastward electrojet by means of upward continuation of ground-based magnetometer data〈/a〉〈br〉 (Mersmann, U., Baumjohann, W. Küppers, F., Lange, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0048.pdf"〉Non-linear rheology and return flow in the mantle〈/a〉〈br〉 (Jacoby, W. R., Ranalli, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0051.pdf"〉Crustal and upper mantle structure beneath the Apennines region as inferred from the study of Rayleigh waves〈/a〉〈br〉 (Calcagnile, G., Panza, G. F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0053.pdf"〉On the coastal effect on geoelectrical soundings〈/a〉〈br〉 (Mundry, E., Worzyk, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0054.pdf"〉Observations of sPn from Swabian Alb earthquakes at the GRF array〈/a〉〈br〉 (Kind, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0055.pdf"〉Macroseismic intensity map of Austria for the Swabian Alb earthquake of September 3, 1978〈/a〉〈br〉 (Drimmel, J., Fiegweil, E., Lukeschitz, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0056.pdf"〉Das Schwerefeld im Bereich der Nordfriesischen Inseln und des benachbarten Festlands〈/a〉〈br〉 (Plaumann, S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0057.pdf"〉Probable relations between seismic anisotropy and a fine structure of the lithosphere〈/a〉〈br〉 (Meissner, R. O., Flüh, E. R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0058.pdf"〉Book reviews〈/a〉〈br〉 (Burkhardt, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0059.pdf"〉Reinterpretation of a deep-seismic-sounding profile on the Ukrainian shield〈/a〉〈br〉 (Jentsch, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0062.pdf"〉Extensions of the reflectivity method〈/a〉〈br〉 (Kind, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0063.pdf"〉Ray amplitudes of compressional, shear and converted seismic body waves in 3D laterally inhomogeneous media with curved interfaces〈/a〉〈br〉 (Pšenčík, I.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0064.pdf"〉Spectral analysis of Pc3 and Pc4 pulsations with regard to the dayside plasmapause position〈/a〉〈br〉 (Palandt, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0065.pdf"〉A theoretical investigation of the dipole- and unipole-resistivity methods for geoelectrical prospecting in Marine areas〈/a〉〈br〉 (Sebulke, J., Hildebrandt, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0066.pdf"〉Paleomagnetism and rock magnetism of the Pliocene Rhyolite at San Vincenzo, Tuscany, Italy〈/a〉〈br〉 (Lowrie, W., Alvarez, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0067.pdf"〉On the presence of titanomagnetite in basalts〈/a〉〈br〉 (Radhakrishnamurty, C., Deutsch, E. R., Murthy, G. S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0045/LOG_0068.pdf"〉Palaeomagnetism of permo-triassic red sandstones from the northern Calcareous Alps〈/a〉〈br〉 (Soffel, H.)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DGG, DFG, SUB Göttingen
    Keywords: 550 ; Aurora ; Auroral Electrojet ; Austria ; Chapman-Ferraro Model ; Crustal Structure ; Earth Models ; Earthquakes ; Earth's Mantle ; Electrical Conductivity Anomalies ; Electromagnetic Induction ; Explosion Seismology ; Free Oscillation of Earth ; Geoelectrics ; Geomagnetic Activity ; Geomagnetic Pulsations ; Geothermics ; Germany ; Gravity Anomalies ; Hurricanes ; Iceland ; India ; Inverse Problems ; Ionosphere ; Ionosphäre ; Italy ; Lithosphere ; Magnetic Anomalies ; Magnetotellurics ; Moho ; Ocean Surface Waves ; Palaeomagnetism ; Polarisation Analysis ; Plasmapause ; Remote Sensing ; Rock Magnetism ; Seismic Anisotropy ; Seismicity ; Seismic Quality Factor Q ; Seismic Surface Waves ; Theoretical Seismograms ; USSR ; Viscosity of Earth ; FID-GEO-DE-7
    Language: German , English
    Type: anthology_digi
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  • 19
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    Insights into the fragmentation of the Adria Plate (2018)
    Details
    Publication Date: 2020-11-30
    Description: This study gives an interpretation of the current tectonics and kinematics of the Adria Plate, a region mostly coinciding with Italy and its surroundings. We have examined the spatial distribution and kinematics of seismicity by using an updated dataset obtained integrating the available catalogues of earthquakes and focal mechanisms. Moreover, to highlight the distribution of seismicity and of the asso- ciated strain patterns, we have elaborated a seismic flux map of the Italian region, which is a map of the energy released per unit time and per unit area. Seismic flux represents the energy released and provides a synthetic and continuous view of areas with greater seismicity and associated strain patterns with respect to the plot of earthquakes only. The seismic data, and the results of some elaborations car- ried out using these datasets have been compared with the present-day state of stress and slip rates of the major active faults of some sectors of Italy, as well as with the horizontal kinematics highlighted by GPS observations. The distribution and kinematics of earthquakes and active faults, the seismic flux, and GPS velocities, suggest that the Adria Plate is currently behaving as an ensemble of independent blocks rather than as a unique rigid plate. The Adria Plate can be thus subdivided into three major blocks and a number of smaller blocks moving independently under the action of a first-order mechanism related to the ongoing, roughly N-S, Europe-Africa convergence vector. This complicated setting may promote the occurrence of mutual relationships between blocks, and generate peculiar local kinematics causing seis- mic activity. We infer that the great majority of the seismic events occur at the boundaries of the main or minor blocks, and therefore the alignments of seismicity allows the individuation of the different blocks and the main seismogenic belts. A major crustal structure subdivides the Adria Plate into a western and two eastern blocks, and approximately coincides with the axial zone of the Apennines along which most of the seismicity is concentrated.
    Description: Published
    Description: 121-138
    Description: 1T. Deformazione crostale attiva
    Description: 1IT. Reti di monitoraggio
    Description: 4IT. Banche dati
    Description: JCR Journal
    Keywords: Adria plate ; Apennines ; Active tectonics ; Seismicity ; Seismic flux ; GPS ; 04.06. Seismology ; 04.03. Geodesy ; 04.07. Tectonophysics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 20
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    Structural inheritance controlling active crustal deformation in the Val d’Agri area (southern Apennines, Italy): new insights from finite element modelling (2018)
    Details
    Publication Date: 2019-01-18
    Description: The availability of a large amount of surface geological data and subsurface information gathered by the oil industry, together with seismic and geodetic data, allowed us to define and analyse the active structures in the Val d'Agri area of the southern Apennines. Taking into account that the study of interseismic deformation can be significant to identify locked fault areas that can potentially slip, in this study we present 2D elastoplastic finite-element models to reproduce interseismic characteristics of the study area. This hosts the largest Europe's onshore oil field and is characterised by an active extensional tectonic regime, as inferred from earthquake focal mechanisms and fault slip data from late Quaternary structures. Based on high-quality seismic profiles tied with deep well logs, we constructed a detailed geological section across the study area. Outcropping units are dissected by numerous brittle structures that formed at various stages during the tectonic evolution of the Apennines, while the deep ones are dominated by deeply rooted major faults. The rheological behaviour has been constrained by the reconstruction of the thermal structure of the fold and thrust belt, using available information from the foreland Apulian Platform and from temperature data from a series of wells. Starting from the geological model, we reproduced interseismic deformation by means of finite-element numerical modelling, varying boundary conditions and unlocking different fault segments. Our numerical models provide new insights into the controversial and widely debated active tectonic setting of the Val d'Agri area, confirming the major role played by structural inheritance and reactivation processes. In fact, recent low-magnitude seismicity tends to illuminate fault segments consisting of pre-existing reverse faults reactivated as normal faults in the present-day stress field. These long-lived, mature fault systems occurring in the buried Apulian Platform carbonates (and underlying basement) represent major brittle structures that cumulated displacements of up to a few kilometres over geologic time. As a result of their reactivation within the late Quaternary extensional stress field, these long-lived crustal structures are capable of nucleating also moderate- to large-magnitude earthquakes. The decoupling between deep and shallow structural levels, and the different inherited structures affecting them, explain the apparent contrast between the subdued surface expression of active fault systems and the known occurrence of large magnitude seismic events in the study area, thus reconciling apparently contrasting geological and geophysical constraints.
    Description: Published
    Description: 111-114
    Description: 1T. Deformazione crostale attiva
    Description: N/A or not JCR
    Keywords: Active tectonics ; Fault reactivation ; Stress field ; Seismicity ; Extensional tectonics ; Seismology ; Tectonophysics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 21
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    Unknown
    Journal of Geophysics - Zeitschrift für Geophysik 46 (2018)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 35 Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1979.
    Description: Inhaltsverzeichnis: Journal of Geophysics 46 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0008.pdf"〉Wave Propagation in Stratifield Anisotropic Media〈/a〉〈br〉 (Bossy, L.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0009.pdf"〉Radio Pulse Dispersion in the Ionosphere〈/a〉〈br〉 (Paul, A. K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0010.pdf"〉Ionospheric Absorption and Profiles of Electron Density and Loss-Rate in the Lower Ionosphere〈/a〉〈br〉 (Kotadia, K. M., Gupta, A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0011.pdf"〉Effective Energy Reception of the Electron Gas per Created Ion Electron Pair〈/a〉〈br〉 (Bilitza, D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0012.pdf"〉Empirical Model of Global Electron Temperature Distribution Between 300 and 700 km Based on Data From Aeros-A〈/a〉〈br〉 (Spenner, K., Plugge, R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0013.pdf"〉Intercomparison Between Aeros Electron Temperature Model and Mean Temperature Profiles of Different Incoherent Scatter Radar Stations〈/a〉〈br〉 (Spenner, K., Bilitza, D., Plugge, R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0014.pdf"〉Simultaneous Smoothed Variations of Signal Amplitude and Mean Doppler Shift in 42 MHz Auroral Backscatter〈/a〉〈br〉 (Haldoupis, C. I., Sofko, G. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0015.pdf"〉Overnight Statiscal Variation of the North-South Movements of Radio Auroral Irregularities〈/a〉〈br〉 (Haldoupis, C. I., Sofko, G. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0016.pdf"〉Q of Mode 〈sub〉O〈/sub〉S〈sub〉O〈/sub〉〈/a〉〈br〉 (Knopoff, L., Zürn, W., Rydelek, P. A., Yogi, T.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0017.pdf"〉Finite Element Convection Models: Comparison of Shallow and Deep Mantle Convection, and Temperatures in the Mantle 〈/a〉〈br〉 (Kopitzke, U.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0018.pdf"〉Detection Probabilities for Weak Regional Seismic Events〈/a〉〈br〉 (Shapira, A., Kulhánek, O., Wahlström, R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0019.pdf"〉Accuracy of Ray Theoretical Seismograms〈/a〉〈br〉 (Červený, V.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0020.pdf"〉Auroral Particle Fluxes in the Ionosphere〈/a〉〈br〉 (Wilhelm, K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0021.pdf"〉The Shape of the Cosmic Ray Modulation Region of the April 30, 1976, Event, as Deduced from HELIOS-1, HELIOS-2, IMP-8, and Neutron Monitor Data〈/a〉〈br〉 (Geranios, A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0022.pdf"〉Magnetic Rotational Hysteresis Loss in Titanomagnetites and Titanomaghemites – Application to Non-Destructive Mineral Identification in Basalts〈/a〉〈br〉 (Manson, A. J., O’Donovan, J. B., O’Reilly, W.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0023.pdf"〉The Geomagnetic Field and Its Secular Variation on Finland and Nearby Countries〈/a〉〈br〉 (Nevanlinna, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0024.pdf"〉Age and Crustal Structure of the Canary Islands〈/a〉〈br〉 (Schmincke, H.-U.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0025.pdf"〉Rinneite-Dating of Episodic Events on Potash Salt Deposits〈/a〉〈br〉 (Lippolt, H. J., Raczek, I.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0026.pdf"〉Magnetic ULF-Waves in the Vicinity of Active Auroral Forms〈/a〉〈br〉 (Klöcker, N., Theile, B.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0027.pdf"〉Bursts of Irregular Magnetic Pulsations During the Substorm〈/a〉〈br〉 (Kangas, J., Pikkarainen, T., Golikov, Y., Baransky, L., Troitskaya, V., Sterlikova, V.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0028.pdf"〉Cosmic Noise Absorption Events and Magnetic Pulsation Activity During Substorms〈/a〉〈br〉 (Wedeken, U., Hillebrand, O., Krenzien, E., Ranta, A., Ranta, H., Voelker, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0029.pdf"〉On the Sources of the 12-Month Wave in the An and As Geomagnetic Activity Indices〈/a〉〈br〉 (Mayaud, P. N.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0030.pdf"〉Calculation of the Effect of the Oceans on Geomagnetic Variations With an Application to the Sq Field During the IGY〈/a〉〈br〉 (Hobbs, B. A., Dawes, G. J. K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0031.pdf"〉Localized Source Effects on Magnetotelluric Apparent Resistivities〈/a〉〈br〉 (Quon, C., Vozoff, K., Hoversten, M., Morrison, H. F., Lee, K.-H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0032.pdf"〉Long-Wavelength Magnetic Anomalies as a Source of Information About Deep Crustal Structure〈/a〉〈br〉 (Krutikhovskaya, Z., Pashkevich, I.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0033.pdf"〉Palaeomagnetism and the Early Magmatic History of Fuerteventura (Canary Islands)〈/a〉〈br〉 (Storetvedt, K. M., Mongstad Våge, H., Aase, S., Løvlie, R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0034.pdf"〉Ray Theoretical Seismograms for Laterally Inhomogeneous Structures〈/a〉〈br〉 (Červený, V.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0035.pdf"〉Macroseismic Field of the Earthquake of September 3, 1978, in the Swabian Jura〈/a〉〈br〉 (Procházková, D., Schneider, G., Schmedes, E., Drimmel, J., Fiegweil, E., Lukeschitz, G., Vogt, J., Courtot, P., Godefroy, P., Grünthal, G., Mayer-Rosa, D., Berger, R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0036.pdf"〉Approximate Diffraction Theory for Transparent Half-Planes with Application to Seismic-Wave Diffraction at Coal Seams〈/a〉〈br〉 (Fertig, J., Müller, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0037.pdf"〉Seismic Investigations of the Subcrustal Lithosphere Beneath Fennoscandia〈/a〉〈br〉 (Cassell, B. R., Fuchs, K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0038.pdf"〉Northern Part of the Tonga Region: A Complicated Subduction Closure〈/a〉〈br〉 (Hanuš, V., Vaněk, J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0039.pdf"〉Palaeomagnetic and Rockmagnetic Properties of the Permian Volcanics in the Western Southern Alps〈/a〉〈br〉 (Heiniger, C.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0040.pdf"〉Palaeomagnetism of Upper Cretaceous Limestones from the Münster Basin, Germany〈/a〉〈br〉 (Heller, F., Channell, J. E. T.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0041.pdf"〉A Two-Dimensional Magnetometer Array for Ground-Based Observations of Auroral Zone Electric Currents During the International Magnetospheric Study (IMS)〈/a〉〈br〉 (Küppers, F., Untiedt, J., Baumjohann, W., Lange, K., Jones, A. G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0046/LOG_0042.pdf"〉Estimation of the Dispersion of Compressional Waves in Rocks From Ultrasonic to Seismic Frequencies〈/a〉〈br〉 (Ramananantoandro, R.)〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Geophysik ; AEROS Satellite ; Alps ; Auroral Zone Phenomena ; Canary Islands ; Coal Prospection ; Cosmic Rays ; Cretaceous ; Crust of Earth ; Electromagnetic Induction ; Electromagnetic Wave Propagation ; Explosion Seismology ; Fennoscandia ; Free Oscillations ; Geochronology ; Geomagnetic Activity ; Geomagnetic Field ; Geomagnetic Pulsations ; Ionosphere ; Lithosphere ; Magnetotellurics ; Mantle of Earth ; Palaeomagnetism ; Rock Magnetism ; Salt Rocks ; Secular Variation ; Seismic Quality Factor Q ; Seismic Waves ; Seismicity ; Sq Variation ; Subduction Zones ; Theoretical Seismograms ; ULF Waves ; FID-GEO-DE-7
    Language: English
    Type: anthology_digi
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  • 22
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    Unknown
    Journal of Geophysics - Zeitschrift für Geophysik 47 (2018)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 34 Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1980.
    Description: Inhaltsverzeichnis: Journal of Geophysics 47 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0011.pdf"〉Iceland: Evolution, Active Tectonics, and Structure. A Preface〈/a〉〈br〉 (Jacoby, W. R., Björnsson, A., Möller, D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0012.pdf"〉Tectonic Framework, Evolution. A Continuum Model of Crustal Generation in Iceland; Kinematic Aspects〈/a〉〈br〉 (Pálmason, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0013.pdf"〉Hawaiian Rifts and Recent Icelandic Volcanism: Expressions of Plume Generated Radial Stress Fields〈/a〉〈br〉 (Wyss, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0014.pdf"〉Observations of the Morphology and Structure of the Sea Floor South and West of Iceland〈/a〉〈br〉 (Johnson, G. L., Pálmason, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0015.pdf"〉Stratigraphy and Paleomagnetism of the Esja, Eyrarfjall and Akrafjall Mountains, SW-Iceland〈/a〉〈br〉 (Kristjansson, L., Fridleifsson, I. B., Watkins, N. D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0016.pdf"〉Magnetic Anomalies (〈i〉ΔZ〈/i〉) in NE-Iceland and Their Interpretation Based on Rock-Magnetic Investigations〈/a〉〈br〉 (Becker, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0017.pdf"〉Palaeointensity Measurement on Postglacial Lavas From Iceland〈/a〉〈br〉 (Schweitzer, Ch., Soffel, H. C.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0018.pdf"〉On the Evolution of the Reykjanes Ridge South of 60° N Between 40 and 12 Million Years Before Present〈/a〉〈br〉 (Voppel, D., Rudloff, R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0019.pdf"〉Morphology and Magnetic Anomalies North of Iceland〈/a〉〈br〉 (Vogt, P. R., Johnson, G. L., Kristjansson, L.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0020.pdf"〉Morphology of the Reykjanes Ridge Crest Near 62°N〈/a〉〈br〉 (Jacoby, W. R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0021.pdf"〉New Heat Flow Observations on the Reykjanes Ridge〈/a〉〈br〉 (Bram, K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0022.pdf"〉Gravity and a Model of the Median Valley〈/a〉〈br〉 (Collette, B. J., Verhoef, J., de Mulder, A. F. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0023.pdf"〉Deformation, Stress, Seismicity. Statistical Analysis of Damaging Earthquakes and Volcanic Eruptions in Iceland From 1550–1978〈/a〉〈br〉 (Gudmundsson, G., Saemundsson, K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0024.pdf"〉Geodetic Measurements and Horizontal Crustal Movements in the Rift Zone of NE-Iceland〈/a〉〈br〉 (Möller, D., Ritter, B.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0025.pdf"〉Results of Height Measurements in Northern Iceland 1965/1977〈/a〉〈br〉 (Spickernagel, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0026.pdf"〉Gravity and Height Variations During the Present Rifting Episode in Northern Iceland〈/a〉〈br〉 (Torge, W., Kanngieser, E.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0027.pdf"〉Gravity and Elevation Changes Caused by Magma Movement Beneath the Krafla Caldera, Northeast Iceland〈/a〉〈br〉 (Johnson, G. V., Björnsson, A., Sigurdsson, S.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0028.pdf"〉Subsidence Events in the Krafla Area, North Iceland, 1975–1979〈/a〉〈br〉 (Tryggvason, E.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0029.pdf"〉Surface Deformation of the Krafla Fissure Swarm in Two Rifting Events〈/a〉〈br〉 (Sigurdsson, O.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0030.pdf"〉Seismological Evidence for Lateral Magma Intrusion During the July 1978 Deflation of the Krafla Volcano in NE-Iceland〈/a〉〈br〉 (Einarsson, P., Brandsdóttir, B.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0031.pdf"〉Measurement of Distance and Tilt Changes in Fissures of Northern Iceland〈/a〉〈br〉 (Pelzer, H., Gerstenecker, C.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0032.pdf"〉Recent Earthquakes in the Hengill-Hellisheidi Area in SW-Iceland〈/a〉〈br〉 (Foulger, G., Einarsson, P.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0033.pdf"〉Rock Stress in an Icelandic Thermal Area, With Implications on Stresses in the Oceanic Lithosphere〈/a〉〈br〉 (Voight, B., Simon, R., Thorsteinsson, T., Pálmason, G., Taylor, C., Seret Opzoomer-Talma, S. H., Haimson, B. C.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0034.pdf"〉Crustal and Upper Mantle Structure. A Model of Electrical Resistivity Beneath NE-Iceland, Correlation with Temperature〈/a〉〈br〉 (Beblo, M., Björnsson, A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0035.pdf"〉A Seismic Study of the Rift Zone in Northern Iceland〈/a〉〈br〉 (Zverev, S. M., Litvinenko, I. V., Pálmason, G., Yaroshevskaya, G. A., Osokin, N. N., Akhmetjev, M. A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0036.pdf"〉A Seismic Crustal Study of the Axial Rift Zone in Southwest Iceland〈/a〉〈br〉 (Zverev, S. M., Litvinenko, I. V., Pálmason, G., Yaroshevskaya, G. A., Osokin, N. N.)〈/li〉 〈li〉〈a href=" https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0037.pdf"〉Seismic Structure of the Icelandic Crust Above Layer Three and the Relation Between Body Wave Velocity and the Alteration of the Basaltic Crust〈/a〉〈br〉 (Flóvenz, Ó. G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0038.pdf"〉Crustal Structure of the Iceland-Faeroe Ridge〈/a〉〈br〉 (Bott, M. H. P., Gunnarsson, K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0039.pdf"〉Reykjanes Ridge Iceland Seismic Experiment (RRISP 77)〈/a〉〈br〉 (Angenheister, G., Gebrande, H., Miller, H., Goldflam, P., Weigel, W., Jacoby, W. R., Pálmason, G., Björnsson, S., Einarsson, P., Pavlenkova, N. I., Zverev, S. M., Litvinenko, I. V., Loncarevic, B., Solomon, S. C.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0040.pdf"〉Seismic Structure of Iceland Along RRISP-Profile I〈/a〉〈br〉 (Gebrande, H., Miller, H., Einarsson, P.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0041.pdf"〉Seismic Structure Along RRISP – Profile I on the Southeast Flank of the Reykjanes Ridge〈/a〉〈br〉 (Goldflam, P., Weigel, W., Loncarevic, B. D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0042.pdf"〉Crustal Development of the Reykjanes Ridge From Seismic Refraction〈/a〉〈br〉 (Bunch, A. W. H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0043.pdf"〉Reykjanes Ridge Crest Studied by Surface Waves With an Earthquake-Pair Technique〈/a〉〈br〉 (Keen, C. E., Fricker, A., Keen, M. J., Blinn, L.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0047/LOG_0044.pdf"〉The Evolution of the Lithosphere at the Southeast Flank of Reykjanes Ridge From Surface Wave Data〈/a〉〈br〉 (Jacoby, W. R., Girardin, N.)〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Geophysik ; Asthenosphere ; Crust and Upper Mantle ; Deformation ; Dynamic Models ; Earthquake Statistics ; Evolution of Crust and Lithosphere ; Geodetic Measurements ; Geothermics ; Gravity ; Heat Flow, Geothermics ; History of Geophysics ; lsostasy ; Lithosphere ; Magma Movement ; Magnetic Anomalies ; Magnetotellurics ; Paleomagnetism ; Plate Tectonics ; Plume Hypothesis ; Ridge Model ; Ridge Structure ; Ridge Topography ; Rifting and Volcanism ; Rock Magnetism ; Seafloor Spreading ; Seafloor Morphology ; Seismic Anisotropy ; Seismicity ; Seismic Reflection ; Seismic Refraction ; Stress, Strain ; Surface Waves ; Temperature ; Velocity-Density Systematics ; Viscosity ; FID-GEO-DE-7
    Language: English
    Type: anthology_digi
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  • 23
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    Dynamics of Vulcano Island investigated by long-term (40 years) geophysical data (2015)
    Details
    Publication Date: 2020-02-24
    Description: Vulcano island is a composite volcanic edifice located in the south-central sector of the Aeolian Archipelago (Tyrrhenian Sea, Italy) and it is an important tourist destination. Historic activity has been characterized by frequent transitions from phereatomagmatic to minor magmatic activity. The last eruption in 1888-90 was characterized by energetic explosive pulses and defines the “vulcanian” type of activity. Since then, volcanic activity has taken the form of fumarolic emanations of variable intensity and temperature, mainly concentrated at “La Fossa” crater, with maximum temperatures ranging between 200° and 300° C; temperature increases and changes in the gas chemistry, were often observed. The most recent episode began in the 80’s when fumarole temperature progressively increased to 690°C in May 1993. Vulcano is active and this favoured monitoring and research studies, in particular focussed on the most recent structures. In the frame of DPC-INGV “V3” project, we investigate the Vulcano dynamics through ca. 40 years of ground deformation and seismicity data collected by the discrete and continuous INGV monitoring networks. We considered levelling, GPS, EDM, seismic and tilt data. EDM and levelling measurements began in the middle 1970s and since the late 1990s the EDM benchmarks have been measurered using GPS. We observed three scales of ground deformation: the first one seems to be linked to the regional tectonics, with a general transpressive kinematics; the second one affects the northern half of the island and could be related to the caldera dynamics; the third one affects only the cone of La Fossa. Regional tectonic stress seems to play an important role in the transition of the volcanic system from a phase of stability to a phase of unrest, inducing the heating and the expansion of shallow hydrothermal fluids. Ground deformation at Vulcano may be linked to the geothermal system rather than magmatic sources.
    Description: Published
    Description: Yogyakarta, Indonesia
    Description: 1V. Storia e struttura dei sistemi vulcanici
    Description: open
    Keywords: Leveling ; Seismicity ; ground deformation ; GPS ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 24
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    The 1998 offshore NW Sicily earthquakes in the tectonic framework of the southern border of the Tyrrhenian Sea (2014)
    Details
    Publication Date: 2020-06-03
    Description: The seismic sequence which occurred in 1998 south of the Island of Ustica (offshore North Sicily) has been interpreted in the frame of historical recent seismicity and the area’s tectonics. This seismic sequence, characterised by shallow-depth and low-magnitude earthquakes (Md max. 4.3), took place in the thick and complex stack of the Sicilian-Maghrebian fold-and-thrust belt. The spatial distribution of the epicentres recorded during the January-August 1998 shows a cluster roughly NW-SE trending. The few shocks which occurred immediately after the Md 4.1 shock of the 14th September were located south-east of Ustica with a rough NE-SW trend. The focal mechanisms of major shocks are of a thrust type with horizontal compressive axes generally N-S trending. In the kinematic evolution of the study area, alternating extensional and contractional events have been recognised as having taken place during the Plio-Pleistocene. The present day seismic activity pointing out a new contractional episode is well framed in this evolutionary trend. The occurrence of pre-existing faults and the large number of earthquakes with low-magnitude support the hypothesis that this seismicity could be related to a frictional (re)activation of faults. Active compression in offshore North Sicily probably reflects the northwards motion of Africa relative to the Eurasian plate.
    Description: Published
    Description: 103-114
    Description: 1T. Geodinamica e interno della Terra
    Description: N/A or not JCR
    Description: restricted
    Keywords: Seismicity ; Stress field ; Sicilian-Maghrebian Chain ; Offshore Norhern Sicily ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 25
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    Seismicity and seismogenic structures in Central Italy: new insigths from the SLAM passive experiment (2014)
    Details
    Publication Date: 2017-04-04
    Description: We investigate the background seismicity of Central Italy in the area including southern Latium, Abruzzi and Molise (SLAM project). Within this region, the central Apenninic chain has been historically affected by many strong earthquakes, some of them very destructive such as the 1349 event (Mw ˜6.7) located at the border between southern Latium and western Molise, the 1654 event (Mw ˜6.4) in the southern Latium-Abruzzi area, and the 1805 Boiano earthquake in the northern Matese range (Mw 6.7). The last important seismic sequence occurred in May 1984 in the Comino Valley, southestern Latium (Mw 5.8). The recent activity is characterized by diffuse low-magnitude seismicity, punctuated by localised small sequences during 2009-2012. Our study focuses on the analysis of seismicity recorded in the period 2009-2013. We present earthquake locations and focal mechanism solutions obtained by standard procedures and an optimized regional 1D velocity model based on the Velest algorithm. The waveform data set was collected from the digital recordings of the permanent stations of the Italian national seismic network, the Abruzzi and Molise regional seismic networks, and from a dense seismic survey carried out in the region between November 2011 and May 2013. The temporary network consisted of 17 three-component seismic stations all equipped with Reftek RT130 digitizers and Lennartz 3D/5s sensors. The deployment of this array improved significantly the detection and location of background seismicity. We relocated more than 4300 events with magnitude ML ranging from about 0.5 to 4.2. Earthquakes distribution shows hypocentral depths concentrated within the upper crust, between 2 and 20 km of depth, and is mostly clustered along the Apenninic chain axis. The computed fault-plane solutions generally display normal fault mechanisms, confirming the extensional NE-SW processes active since Pleistocene in the study region.
    Description: Published
    Description: Goteborg - Svezia - Joint Assembly IAHS - IAPSO - IASPEI
    Description: 2T. Tettonica attiva
    Description: open
    Keywords: Seismicity ; Central Italy ; SLAM passive experiment ; 05. General::05.02. Data dissemination::05.02.02. Seismological data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 26
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    DEEP-TEE Phase 1 (2014)
    GFZ Data Services
    Details
    Publication Date: 2024-02-23
    Description: Abstract
    Description: A seismological experiment was started in July 2014 in and around the East Eifel Volcanic Field, Germany. Following two unusually deep micro-earthquakes in September 2013 (about 40 km depth) a seismic network was installed to record more local seismic events in order to better understand the seismicity and dynamics of this region. Ten recording stations of the GFZ GIPP (Geophysical Instrument Pool Potsdam at Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences) and three recording stations of the KIT KABBA (Karlsruhe BroadBand Array at Karlsruhe Institute of Technology) were placed between the permanent stations of the state earthquake survey (Landeserdbebendienst). Altogether about 18-20 short-period and broadband stations could be used to study the seismicity up to August 2016. This dataset is unique concerning the station density in this region and allows determination of hypocenter parameters with high precision and accuracy, estimation of the local crustal and upper mantle structure as well as using array techniques for wavelengths of about 10-50 km. After August 2016 the network was reconfigured and continuously updated by KIT-GPI and LGB. Waveform data is available from the GEOFON data centre, under network code 1P, and is fully open.
    Keywords: Seismicity ; Eifel region ; Broadband seismic waveforms ; Seismic monitoring ; Monitoring system ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 VOLCANIC ACTIVITY ; In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS 〉 SEISMOLOGICAL STATIONS
    Type: Dataset , Seismic Network
    Format: ~250G
    Format: .mseed
    Format: XML
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  • 27
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    Seismic activity and thermal regime of low temperature fumaroles at Mt. Vesuvius in 2004-2011: distinguishing among seismic, volcanic and hydrological signals (2013)
    Istituto Nazionale di Geofisica e Vulcanologia
    Details
    Publication Date: 2017-04-04
    Description: Seismological, soil temperature and hydrological data from Mt. Vesuvius are collected to characterize the present-day activity of the volcanic/hydrothermal system and to detect possible unrest-related phenomena. We present patterns of seismicity and soil temperature in the crater area during the period February 2004-December 2011. The temporal distribution of number and depth of Volcano-Tectonic earthquakes and the energy release are considered. Hourly data of soil temperature have been acquired since January 2004 in different locations along the rim and within the crater. The observed changes of temperature are studied to establish a temporal-based correlation with the volcanic activity and/or with external forcing, as variations of the regional and local stress field acting on the volcano or meteorological phenomena. The comparison between seismic activity and temperature data highlights significant variations possibly related to changes in fluid circulation in the hydrothermal system of the volcano. The common continuous observations start just before a very shallow earthquake occurred in August 2005, which was preceded by a thermal anomaly. This coincidence has been interpreted as related to fluid-driven rock fracturing, as observed in other volcanoes. For the successive temporal patterns, the seismicity rate and energy release are characterized by slight variations accompanied by changes in temperature. This evidence of reactivity of the fumarole thermal field to seismic strain can be used to discriminate between tectonic and volcanic signals at Mt. Vesuvius.
    Description: Published
    Description: S0441
    Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Description: JCR Journal
    Description: open
    Keywords: Surveys, measurements and monitoring ; Seismicity ; Fumarolic thermal regime ; Multidisciplinary data comparison ; Rest state definition ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 28
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    Vent temperature trends at the Vulcano Fossa fumarole field: the role of permeability (2013)
    Springer Berlin Heidelberg
    Details
    Publication Date: 2017-04-04
    Description: Between 1994 and 2010, we completed 16 thermal surveys of Vulcano’s Fossa fumarole field (Aeolian Islands, Italy). In each survey, between 400 and 1,200 vent temperatures were collected using a thermal infrared thermometer from distances of ∼1 m. The results show a general decrease in average vent temperature during 1994–2003, with the average for the entire field falling from ∼220°C in 1994 to ∼150°C by 2003. However, between 2004 and 2010, we witnessed heating, with the average increasing to ∼190°C by 2010. Alongside these annual-scale field-wide trends, we record a spatial re-organisation of the fumarole field, characterised by shut down of vent zones towards the crater floor, matched by rejuvenation of zones located towards the crater rim. Heating may be expected to be associated with deflation because increased amounts of vaporisation will remove volume from the hydrothermal system Gambino and Guglielmino (J Geophys Res 113: B07402, 2008). However, over the 2004–2010 heating period, no ground deformation was observed. Instead, the number of seismic events increased from a typical rate of 37 events per month during 1994–2000 to 195 events per month during 2004–2010. As part of this increase, we noticed a much greater number of high-frequency events associated with rock fracturing. We thus suggest that the heating event of 2004–2010 was the result of changed permeability conditions, rather than change in the heat supply from the deeper magmatic source. Within this scenario, cooling causes shut down of lower sectors and re-establishment of pathways located towards the crater rim, causing fracturing, increased seismicity and heat flow in these regions. This is consistent with the zone of rejuvenation (which lies towards and at the rim) being the most favourable location for fracturing given the stress field of the Fossa cone Schöpa et al. (J Volcanol Geotherm Res 203:133–145, 2011); it is also the most established zone, having been active at least since the early twentieth century. Our data show the value of deploying multi-disciplinary geophysical campaigns at degassing (fumarolic) hydrothermal systems. This allows more complete and constrained understanding of the true heat loss dynamics of the system. In the case study presented here, it allows us to distinguish true heating from apparent heating phases. While the former are triggered from the bottom-up, i.e. they are driven by increases in heat supply from the magmatic source, the latter are triggered from the top-down, i.e. by changing permeability conditions in the uppermost portion of the system to allow more efficient heat flow over zones predisposed to fracturing.
    Description: Published
    Description: 1293-1311
    Description: 1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
    Description: 1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive
    Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Description: 1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
    Description: 3.6. Fisica del vulcanismo
    Description: JCR Journal
    Description: restricted
    Keywords: Fumaroles ; Vulcano ; Vent temperature ; Seismicity ; Ground Deformation ; Permeability ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 29
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    Are seismogram recorded in schoola educational tools only ? (2013)
    INOGS, ISBN 978-88-902101-1-2
    Details
    Publication Date: 2017-04-04
    Description: In the frame of the NERA project and under the WP 8, an inventory of schools hosting seismic stations for educational purposes has been compiled with the aim, among others, to establish a network for data exchange. Such an inventory reveals that there are more than 600 instruments, most of which in full activity, in schools of the Mediterranean area. The number of stations is somewhat proportional to the date when educational projects began (Zollo et al., in press), so countries like France, United Kingdom or Ireland, all places where a long tradition in “seismology in schools” is established , own most of the existing stations. The make and technical characteristics of these devices widely vary: some schools have assembled their own mechanical seismometer with very simple materials while some others have designed an acquisition system and coupled it to a sensor available on the market. In some cases, stations are bought from semi-professional or professional manufacturers that have devoted a special care to the educational field. These factories have designed cheap instruments the technology of which is based on the more expensive instruments that are instead available at professional level. These recording items are often equipped with an internet connection, have a broad-band like seismometer, offer a real time view of the recording (helicorder) and provide data in SAC format. In a sentence, they are very much similar to the devices currently used in professional (national or regional) networks to monitor seismicity. Moreover, in principle stations installed in a country are very much alike or perfectly identical, representing as a matter of fact a semi-professional seismic network.. It is then straightforward to wonder what is the role of the data recorded and stored by these instruments and especially what is the potential of these information. Are these instruments providing any additional information to the professional seismic networks ? Could they complement a professional database ? In this paper a rough analysis of the data collected by a school network is analysed and compared with “official” data. It is shown that in some cases seismograms recorded from stations in schools can perform very well and their data could, under certain circumstances and with some limitations, be used instead of / in addition to professional data.
    Description: Published
    Description: Teatro Comunale F. Stabile, Potenza, Italy
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: open
    Keywords: Seismicity ; Seismic location ; Seismic network ; Seismometers ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 30
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    The morpho-tectonic setting of the Southeast margin of Iberia and the adjacent oceanic Algero-Balearic Basin (2013)
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Marine and Petroleum Geology 45 (2013): 17-41, doi:10.1016/j.marpetgeo.2013.04.005.
    Description: Multi-beam bathymetry and high-resolution low-penetration seismic reflection profiles of the offshore extensions of the Bétic Internal Zone off Sierra de Cartagena-La Unión margin along its south side and the Mar Menor margin along its east side, the Mazarrón Escarpment forming its southern boundary and the adjacent oceanic Algero-Balearic basin have provided images of the neo-tectonic structures of the region equal to those provided by subaerial photography. For the first time we mapped with unprecedented detail the Mazarrón Escarpment and the Southeast margin of Iberia. The first-order structures of the region are due to the consequence of the collision of the African and Eurasian plates during the Alpine orogeny in late Oligocene-Middle Miocene, the westward migration of the Alborán plate in the Middle Miocene and the desiccation of the Mediterranean in the Messinian (Late Miocene) that led to the deposition of evaporites in the Algero-Balearic basin and erosion of the Mazarrón Escarpment, the Sierra de Cartagena-La Unión shelf, the Mar Menor margin and the adjacent coast. Our data images second order tectonic features (neo-tectonic features) superimposed on the larger structures. These include the deformation of the strata in the Algero-Balearic basin by the gliding of the Plio-Quaternary sediments on Messinian halite on the margins of the basin and sediment loading in its center, the Late Miocene-Quaternary deformation of the area north of the Mazarrón Escarpment resulting from the continuous oblique convergence of the African and Eurasian plates in a NNW-SSE direction, the Miocene to Pleistocene volcanic edifices and pinnacles (dikes), the pockmarks formed by the extrusion of gas/water via faults and the massive gravitational failure of the Mazarrón Escarpment triggered by this plate convergence. The data also show in detail features formed on the Mazarrón Escarpment during the Messinian, Pliocene and Pleistocene regressions and those on the shelf formed during the Pleistocene glacially induced regressions/transgression and sediment drifts generated by modern currents.
    Keywords: Mazarrón Escarpment ; Algero-Balearic Abyssal Plain ; Messinian Diapirs ; African-Eurasian plates ; Faults ; Pockmarks ; Seismicity ; Bétic Cordillera
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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    Format: video/wmv
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  • 31
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    Geological events during the Holocene: an overview for Northern Europe and the Mediterranean (2012)
    Samperi Editore
    Details
    Publication Date: 2017-04-04
    Description: The Holocene is the most recent geological epoch spanning from about 11700 years ago to the present day. The most important human civilizations appeared during the Holocene. From the Holocene onwards, environmental changes, and the hazards associated with them, became extremely important for their impact on historical events, in some cases blending with humanity’s vicissitudes and influencing the rise and decline of civilizations. This paper summarises the geological and climatic conditions of Northern Europe during the Holocene and tries to determine whether or not they support the hypothesis formulated by Felice Vinci (Vinci, 2003) about the migration of Baltic populations towards the Mediterranean in the Bronze Age at the end of the “climatic optimum” (Houghton et al., 1990; Rohling & De Rijk, 1999). This study presents data on glacio-eustatic changes and on isostatic uplift together with information on probable tsunamis that occurred in the North Atlantic, North Sea, Scandinavia and the Baltic Sea. Moreover, some data on catastrophic events that affected the Mediterranean region are reported, because these catastrophes could have favoured the settlement of “people coming from the sea” that took advantage of the demographic and socio-economic weakening of indigenous populations (Driessen, 2002). The paper aims to provide geological and palaeogeographic constraints to the hypotheses formulated by Felice Vinci on the migration of Scandinavians towards the Mediterranean. The data analysed have been collected from the available scientific literature (see references). The amount of information available for each geological phenomenon is vast and sometimes theories developed from the same data are in conflict. The comparison between the Mediterranean and the Baltic areas (one of which could have been the theatre of the Homeric events) will be useful to find evidence of geological phenomena within the Homeric texts, giving useful indications to better understand where the poems are set or at least to provide interesting discussion points related to Felice Vinci’s hypothesis (Vinci 2003).
    Description: Published
    Description: 179-197
    Description: 3.10. Storia ed archeologia applicate alle Scienze della Terra
    Description: open
    Keywords: Geology ; Holocene ; Northern Europe ; Mediterranean ; Earthquakes ; Volcanoes ; Ice age ; Tides ; Tsunami ; Glacio-eustatism ; Seismicity ; Uplift ; Submarine landslides ; 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous ; 04. Solid Earth::04.06. Seismology::04.06.05. Historical seismology ; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous ; 05. General::05.02. Data dissemination::05.02.99. General or miscellaneous ; 05. General::05.02. Data dissemination::05.02.02. Seismological data ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions ; 05. General::05.08. Risk::05.08.99. General or miscellaneous ; 05. General::05.09. Miscellaneous::05.09.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 32
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    Magma intrusion mechanisms and redistribution of seismogenic stress at Mt. Etna volcano (1997–1998) (2012)
    Blackwell Publishing Ltd
    Details
    Publication Date: 2017-04-04
    Description: Several volcanoes worldwide have shown changes in their stress state as a consequence of the deformation produced by the pressurization of a magmatic body. This study investigates seismic swarms occurring on the western flank of Mt. Etna in January 1997 - January 1998. Integrating seismic observations and geodetic data, we constrained the seismogenic fault system, and on the basis of stress tensor inversion and SHMAX analyses, we infer an inflating pressure source located at 5.5 km b.s.l. beneath the west portion of summit area. Evaluation of Coulomb failure stress (CFS) related to the proposed model, showed how a large part of the seismogenic fault underwent a significant CFS increase (500 kPa). We infer the presence of a sub-vertical faulted region, potentially weak, N50°E oriented beneath the western sector of Mt. Etna. This structure could be brought closer to failure thereby generating seismic swarms as the effect of elastic stress transfer induced by movement and/or overpressure of magmatic masses within the upper crust under the volcano.
    Description: This research was funded by the INGV–DPC 2007–2009 Agreement (Project V4_Flank).
    Description: Published
    Description: 339-348
    Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Description: JCR Journal
    Description: restricted
    Keywords: Etna ; modelling ; Seismicity ; GPS monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
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  • 33
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    Seismic insight into explosive paroxysms at Stromboli volcano, Italy (2012)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: At Stromboli volcano, Italy, continuous seismic monitoring and periodic, visual observations of volcanic activity for surveillance purposes began in the mid-1980s. Since 1985, two eruptions have occurred, one lasting from December, 1985 until April, 1986, and one in May, 1993. There have also been two small overflows, in 1990 and 1994. Since these episodes of lava effusion, the persistent Strombolian activity of the volcano has had several fluctuations during the past 15 years. Some episodes climaxed in powerful explosions. According to seismic records, these paroxysms consisted of a variable number of explosion quakes in rapid succession (i.e. from tens of seconds to a few minutes), associated with a notable increment in the amplitude of volcanic tremor. Throughout these episodes - which are called explosive sequences - lapilli, fragments of old rock, and bombs of varying dimensions were ejected, affecting an area greater than the crater terrace where the active craters are located. In this article, we describe the explosive sequences recorded at Stromboli between 1985 and 1999. We provide a characterization in terms of reduced displacement and duration for nine episodes occurring in 1998 and 1999. Their reduced displacements range from 15 to 124 cm2; their durations are between 6 and 18 min. We find no change in the frequency content of the seismic signal several minutes before and during the sequences. Considering medium- to long-term behavior, the spectral amplitude of the seismic signal decreases or has low values over several months preceding the occurrence of the paroxysms. This feature is common to 20 of the 22 explosive sequences, and is indicative of internal conditions that periodically characterize the feeder. We surmise that the paroxysms are the result of the partial obstruction of the volcanic conduit when the magma column is low or dropping. The onset of the explosive sequence, causing the sudden removal of the material which forms the obstruction, would trigger a sudden depressurization of the conduit and the rapid rise of magma from depth.
    Description: Published
    Description: 137-150
    Description: JCR Journal
    Description: reserved
    Keywords: Stromboli ; Paroxysms ; Seismicity ; Volcanoes ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
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  • 34
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    Seismicity of the Atlantis Massif detachment fault, 30°N at the Mid-Atlantic Ridge (2012)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 13 (2012): Q0AG11, doi:10.1029/2012GC004210.
    Description: At the oceanic core complex that forms the Atlantis Massif at 30°N on the Mid-Atlantic Ridge, slip along the detachment fault for the last 1.5–2 Ma has brought lower crust and mantle rocks to the seafloor. Hydroacoustic data collected between 1999 and 2003 suggest that seismicity occurred near the top of the Massif, mostly on the southeastern section, while detected seismicity along the adjacent ridge axis was sparse. In 2005, five short-period ocean bottom seismographs (OBS) were deployed on and around the Massif as a pilot experiment to help constrain the distribution of seismicity in this region. Analysis of six months of OBS data indicates that, in contrast to the results of the earlier hydroacoustic study, the vast majority of the seismicity is located within the axial valley. During the OBS deployment, and within the array, seismicity was primarily composed of a relatively constant background rate and two large aftershock sequences that included 5 teleseismic events with magnitudes between 4.0 and 4.5. The aftershock sequences were located on the western side of the axial valley adjacent to the Atlantis Massif and close to the ridge-transform intersection. They follow Omori's law, and constitute more than half of the detected earthquakes. The OBS data also indicate a low but persistent level of seismicity associated with active faulting within the Atlantis Massif in the same region as the hydroacoustically detected seismicity. Within the Massif, the data indicate a north-south striking normal fault, and a left-lateral, strike-slip fault near a prominent, transform-parallel, north-facing scarp. Both features could be explained by changes in the stress field at the inside corner associated with weak coupling on the Atlantis transform. Alternatively, the normal faulting within the Massif might indicate deformation of the detachment surface as it rolls over to near horizontal from an initial dip of about 60° beneath the axis, and the strike-slip events may indicate transform-parallel movement on adjacent detachment surfaces.
    Description: We thank the Deep Ocean Exploration Institute at WHOI, Director of Research at WHOI, WHOI’s Department of Geology and Geophysics, and the National Science Foundation for funding the data collection.
    Description: 2013-04-09
    Keywords: Atlantis Massif ; Mid-Atlantic Ridge ; T-phase ; Hydroacoustic ; Oceanic detachment fault ; Seismicity
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 35
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    Rapporto sugli eventi sismici del Beneventano (2011)
    Details
    Publication Date: 2017-04-04
    Description: Not Present
    Description: Osservatorio Vesuviano
    Description: Published
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: open
    Keywords: Benevento ; Seismicity ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 36
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    Rapporto sull’evento sismico vesuviano del 25 Aprile 1996 (2011)
    Details
    Publication Date: 2017-04-04
    Description: In the text
    Description: Osservatorio Vesuviano
    Description: Published
    Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Description: open
    Keywords: Vesuvio ; Seismicity ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 37
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    Seismicity at the border between the Southern and Central Apennines (Italy):a review (2011)
    ISTITUTO NAZIONALE DI OCEANOGRAFIA E DI GEOFISICA
    Details
    Publication Date: 2017-04-04
    Description: We review the instrumental seismicity at the boundary between the Southern and Central Apennines with the aim of detecting the active structures...
    Description: Published
    Description: 129-142
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: JCR Journal
    Description: reserved
    Keywords: Seismicity ; Southern and Central Apennines ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution
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  • 38
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    The Mw 6.4 SW-Achaia (western Greece) earthquake sequence of 8 June 2008: Seismological, field, GPS observations and stress modeling (2010)
    Taylor & Francis
    Details
    Publication Date: 2021-06-07
    Description: On June 8, 2008 a Mw = 6.4 earthquake occurred in NW Peloponnese, western Greece. This event is the largest strike-slip earthquake to occur in western Greece during the past 25 years. No surface rupture was observed. Many rock falls, slides, and liquefaction features have been found as is typical for an earthquake of this size. Double-difference relocations of 370 aftershocks show a linear pattern of events and define a clear NE-SW striking mainshock fault plane. The hypocentrer was determined at 18 km depth beneath village Mihoi in SW Achaia. The 24-hr aftershock region extends approximately 30 km in length, and the width of the surface projection of the aftershocks ranges between 5–10 km. The depth of the aftershocks rarely exceeds 22 km. Analysis of high-rate GPS data showed that station RLS (Riolos) which is located 12.8 km N5 W of the epicenter was displaced co-seismically 7 mm to the North in agreement with right-lateral kinematics of the rupture. Static (Coulomb) stress transfer analysis indicates loading of faults near the towns of Patras (north) and Amaliada (south), respectively. The earthquake put more emphasis on the role of strike-slip in the deformation of western Greece also indicating that seismic strain is partitioned between strike-slip and normal-slip events due to obliquity of the Nubia (Africa) – Eurasia convergence.
    Description: Published
    Description: 1101-1124
    Description: 1.9. Rete GPS nazionale
    Description: JCR Journal
    Description: reserved
    Keywords: Western Greece ; Strike-Slip ; Seismicity ; GPS ; HypoDD ; Coulomb Stress ; Active Tectonics ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
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  • 39
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    Interactions between volcanism and tctonics in the western Aeolian sector, southern Tyrrhenian Sea (2010)
    Wiley-Blackwell Publishing
    Details
    Publication Date: 2021-07-14
    Description: New high-resolution bathymetric and magnetic data from the western Aeolian sector, southern Tyrrhenian Sea, provide insights into structural and volcanic development of the area, suggesting a strong interaction between volcanism and tectonics. The analysis of these data combined with relocated earthquake distribution, focal plane solutions and strain rate evaluation indicates that the dextral strike-slip Sisifo-Alicudi shear zone is a complex and wide area of active deformation, representing the superficial expression of the deep seated lithospheric tear fault separating the subduction slab below Sicily and Calabria. Most of the observed volcanic features are aligned along a NW–SE trend, such as the Filicudi island-Alicudi North Seamount and Eolo-Enarete alignments, and are dissected by hundred-metre-high scarps along conjugate NNE–SSW trending fault systems. The magnetic field pattern matches the main trends of volcanic features. Spectral analysis and Euler deconvolution of magnetic anomalies show the existence of both deep and shallow sources. High-amplitude, high-frequency anomalies due to shallow sources are dominant close to the volcanic edifices of Alicudi and Filicudi, while the main contribution on the surrounding Eolo, Enarete, Alicudi North and Filicudi North seamounts is given by low-amplitude anomalies and/or deeper magnetic sources. This is probably related to different ages of the volcanic rocks, although hydrothermal processes may have played an important role in blanketing magnetic anomalies, in particular at Enarete and Eolo seamounts. Relative chronology of the eruptive centres and the inferred deformation pattern outline the Quaternary evolution of the western Aeolian Arc: Sisifo, Alicudi North and Filicudi North seamounts might have developed in an early stage, following the Late Pliocene–Early Pleistocene SE-ward migration of arc-related volcanism due to the Ionian subduction hinge retreat; Eolo, Enarete and Filicudi represent later manifestations that led volcanoes to develop duringMid-Late Pleistocene, when the stress regime in the area changed, due to the SSE-ward propagation of the subduction slab tear fault and the consequent reorientation and decrease of trench migration velocity. Finally, volcanic activity occurred in a very short time span at Alicudi, where an almost conical volcanic edifice emerged, suggesting negligible interactions with regional fault systems.
    Description: Published
    Description: 64-78
    Description: 2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attive
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: 3.4. Geomagnetismo
    Description: JCR Journal
    Description: restricted
    Keywords: Magnetic anomalies ; Seismicity ; volcanic arc process ; 04. Solid Earth::04.04. Geology::04.04.04. Marine geology ; 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics ; 04. Solid Earth::04.07. Tectonophysics::04.07.08. Volcanic arcs
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  • 40
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    Stress aligned cracks in the upper crust of the Val d’Agri region as revealed by Shear Wave Splitting (2010)
    Details
    Publication Date: 2017-04-04
    Description: Shear wave splitting is measured at 19 seismic stations of a temporary network deployed in the Val d’Agri area to record low-magnitude seismic activity. The splitting results suggest the presence of an anisotropic layer between the surface and 15 km depth (i.e. above the hypocentres). The dominant fast polarization direction strikes NW–SE parallel to the Apennines orogen and is approximately parallel to the maximum horizontal stress in the region, as well as to major normal faults bordering the Val d’Agri basin. The size of the normalized delay times in the study region is about 0.01 s km−1, suggesting 4.5 per cent shear wave velocity anisotropy (SWVA). On the south-western flank of the basin, where most of the seismicity occurs, we found larger values of normalized delay times, between 0.017 and 0.02 s km−1. These high values suggest a 10 per cent of SWVA. These parameters agree with an interpretation of seismic anisotropy in terms of the Extensive-Dilatancy Anisotropy (EDA) model that considers the rock volume pervaded by fluid-saturated microcracks aligned by the active stress field. Anisotropic parameters are consistent with borehole image logs from deep exploration wells in the Val d’Agri oil field that detect pervasive fluid saturated microcracks striking NW–SE parallel to the maximum horizontal stress in the carbonatic reservoir. However, we cannot rule out the contribution of aligned macroscopic fractures because the main Quaternary normal faults are parallel to the maximum horizontal stress. The strong anisotropy and the seismicity concentration testify for active deformation along the SW flank of the basin.
    Description: Published
    Description: 601-614
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: partially_open
    Keywords: Seismicity ; Tectonics ; Seismic anisotropy ; Crustal structure ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
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  • 41
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    Analysis of small magnitude seismic sequences along the Northern Apennines (Italy) (2010)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: We analyze the seismicity of a small sector of the Northern Apennines merging data from the Italian seismic bulletin with original data collected by temporary seismic networks. Our attention is focused on the region enclosed between the Apenninic watershed and the Adriatic Sea. This portion of belt is interested by the occurrence of diffuse crustal seismicity and small-to-moderate earthquakes. In this paper we study the five small sequences with mainshock having Mw 〈 4.7 that in the past 15 years hit the area. Our interest is addressed to better understand the relationship between these events and the regional seismotectonic setting in terms of seismicity distribution and stress field. Two regions with different behavior in the seismic release can be distinguished: (i) along the watershed where seismicity is clustered at shallow depths (〈 15 km) and where strong earthquakes occurred in the past, (ii) an eastern portion where the seismicity is distributed across all of the crustal volume, locally reaching depths down to 30 km. The focal mechanism of the seismic sequences shows mainly normal fault kinematics coherent with the regional stress field. Detailed stress field analysis suggests a rotation of the principal stress axis moving from the axial part of the chain toward the Adriatic Sea to the east.
    Description: Published
    Description: 136-144
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: reserved
    Keywords: Northern Apennines ; Stress field ; Focal mechanisms ; Seismicity ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
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  • 42
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    Seismicity in Central and Northern Apennines integrating the Italian national and regional networks (2010)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: In this paper we present and discuss an improved picture of the seismicity distribution of the Umbria– Marche–Abruzzi Apennines as obtained through the integration of the national and the regional seismic networks operating from 2002 to 2006. During this period, both the Istituto Nazionale di Geofisica e Vulcanologia (INGV) National Seismic Network and the regional networks have been greatly improved. We compare the results of the integrated catalogue obtained in this study with the Catalogue of the Italian Seismicity between 1981 and 2001 [Castello, B., Selvaggi, G., Chiarabba, C., Amato, A., 2006. CSI Catalogo della sismicità italiana 1981–2002, versione 1.1. INGV-CNT, Roma.http://legacy.ingv.it/CSI )], confirming the basic known features of the seismic activity in the region, but also evidencing some original and interesting results. In particular, the new data set allows us to better define the geometry and kinematics of the crustal seismicity, which is confined to the upper 20 km and shows a clear general deepening from west to east. In the crust, we find additional evidence of extensional seismicity below the central portion of the belt and thrust/reverse faulting mechanisms at the outer fronts of the Apennines. Looking at the seismicity along the belt, it is also possible to observe aseismic regions, which could be due to either locked or creeping portions of the Apenninic fault system. At greater depth, the west-dipping seismicity distribution down to about 70 km confirms the hypothesis of a slab of Adriatic lithosphere subducted below the Apennines, but also suggests that there are strong lateral heterogeneities and possibly tears in the slab.
    Description: Published
    Description: 121-135
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: JCR Journal
    Description: reserved
    Keywords: Seismicity ; Seismic monitoring ; Focal mechanisms ; Subduction ; Apennines ; Italy ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 43
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    Geochemistry of fluids discharged over the seismic area of the Southern Apennines (Calabria region, Southern Italy): Implications for Fluid-Fault relationships (2010)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: The first comprehensive geochemical data-set of the fluids circulating over a 14,000 km2-wide seismicprone area of the Southern Apennines, Calabria Region (Italy), is presented here. The geochemical investigations were carried out with the twofold aim of constraining the origin and interactions of the circulating fluids and to investigate possible relationships with local faults. Sixty samples of both thermal and cold waters were collected, from which the dissolved gases were extracted. The geochemical features of the water samples display different types and degrees of water–rock interactions, irrespective of the outlet temperature. The calculated equilibrium temperatures of the thermal waters (60–160 C) and the low heat flow of thewhole study area, are consistent with a heating process due to deep water circulation and rapid upflow through lithospheric structures. The composition of the dissolved gases reveals that crustal-originating gases (N2 and CO2-dominated) feed all the groundwaters. The 3He/4He ratios of the dissolved He, in the range of 0.03–0.22Rac for the thermal waters and 0.05–0.63Rac for the cold waters (Rac = He isotope ratio corrected for atmospheric contamination), are mainly the result of a two-component (radiogenic and atmospheric) mixing, although indications of mantle-derived He are found in some cold waters. As the study area had been hit by 18 of the most destructive earthquakes (magnitude ranging from 5.9 to 7.2) occurring over a 280-a time span (1626–1908) in the Southern Apennines, the reported results on the circulating fluids may represent the reference for a better inside knowledge of the fault-fluid relationships and for the development of long-term geochemical monitoring strategies for the area.
    Description: Published
    Description: 540–554
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: Fluids ; Geochemistry ; Faults ; Seismicity ; 04. Solid Earth::04.02. Exploration geophysics::04.02.01. Geochemical exploration
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  • 44
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    Earthquake focal mechanisms and stress inversion in the Irpinia Region (southern Italy) (2010)
    SPRINGER
    Details
    Publication Date: 2017-04-04
    Description: The goal of this study was to estimate the stress field acting in the Irpinia Region, an area of southern Italy that has been struck in the past by destructive earthquakes and that is now characterized by low to moderate seismicity. The dataset are records of 2,352 aftershocks following the last strong event: the 23 November 1980 earthquake (M 6.9). The earthquakes were recorded at seven seismic stations, on average, and have been located using a three-dimensional (3D) P-wave velocity model and a probabilistic, non-linear, global search technique. The use of a 3D velocity model yielded amore stable estimation of take-off angles, a crucial parameter for focal mechanism computation. The earthquake focal mechanisms were computed from the P-wave first-motion polarity data using the FPFIT algorithm. Fault plane solutions show mostly normal component faulting (pure normal fault and normal fault with a strikeslip component). Only some fault plane solutions show strike-slip and reverse faulting. The stress field is estimated using the method proposed by Michael (J Geophys Res 92:357–368, 1987a) by inverting selected focal mechanisms, and the results show that the Irpinia Region is subjected to a NE–SW extension with horizontal σ3 (plunge 0◦, trend 230◦) and subvertical σ1 (plunge 80◦, trend 320◦), in agreement with the results derived from other stress indicators.
    Description: Published
    Description: 107-124
    Description: 3.1. Fisica dei terremoti
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: reserved
    Keywords: Irpinia Region ; Seismicity ; Focal mechanisms ; Stress inversion ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics ; 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
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  • 45
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    Anomalous fluid emission of a deep borehole in a seismically active area of Northern Apennines (Italy) (2010)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: The Miano borehole, 1047 m deep, is located close to the river Parma in the Northern Apennines, Italy. A measuring station has been installed to observe the discharge of fluids continuously since November 2004. The upwelling fluid of this artesian well is a mixture of thermal water and CH4 as main components. In non-seismogenic areas, a relatively constant fluid emission would be expected, perhaps overlaid with long term variations from that kind of deep reservoir over time. However, the continuous record of the fluid emission, in particular the water discharge, the gas flow rate and the water temperature, show periods of stable values interrupted by anomalous periods of fluctuations in the recorded parameters. The anomalous variations of these parameters are of low amplitude in comparison to the total values but significant in their long-term trend. Meteorological effects due to rain and barometric pressure were not detected in recorded data probably due to reservoir depth and relatively high reservoir overpressure. Influences due to the ambient temperature after the discharge were evaluated by statistical analysis. Our results suggest that recorded changes in fluid emission parameters can be interpreted as a mixing process of different fluid components at depth by variations in pore pressure as a result of seismogenic stress variation. Local seismicity was analyzed in comparison to the fluid physico-chemical data. The analysis supports the idea that an influence on fluid transport conditions due to geodynamic processes exists. Water temperature data show frequent anomalies probably connected with possible precursory phenomena of local seismic events.
    Description: Published
    Description: 555–571
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: Fluids ; Seismicity ; 04. Solid Earth::04.02. Exploration geophysics::04.02.01. Geochemical exploration
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  • 46
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    Interrelationships between vent fluid chemistry, temperature, seismic activity, and biological community structure at a mussel-dominated, deep-sea hydrothermal vent along the East Pacific Rise (2010)
    National Shellfisheries Association
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © National Shellfisheries Association, 2008. This article is posted here by permission of National Shellfisheries Association for personal use, not for redistribution. The definitive version was published in Journal of Shellfish Research 27 (2008): 177-190, doi:10.2983/0730-8000(2008)27[177:IBVFCT]2.0.CO;2.
    Description: In April 1991, submarine volcanic eruptions initiated the formation of numerous hydrothermal vents between 9°45′ and 9°52′N along the crest of the East Pacific Rise (EPR). Dramatic changes in biological community structure and vent fluid chemistry have been documented throughout this region since the eruptive event. By April 2004, mussels (Bathymodiolus thermophilus) dominated the faunal assemblages at several of the vent sites formed during of after the 1991 eruptions, whereas other habitats within the region were dominated by the vestimentiferan Riftia pachyptila. In the present paper, we build upon the extensive data sets obtained at these sites over the past decade and describe a manipulative experiment (conducted at 9°49.94′N; 104°14.43′W on the EPR) designed to assess interrelationships between vent fluid chemistry, temperature, biological community structure, and seismic activity. To this end, in situ voltammetric systems and thermal probes were used to measure H2S/HS− and temperature over time in a denuded region of an extensive mussel bed in which an exclusion cage was placed to inhibit the subsequent migration of mussels into the denuded area. Fluid samples were taken from the same locations to characterize the associated microbial constituents. Basalt blocks, which were placed in the cage in April 2004 and subsequently recovered in April 2005, were colonized by more than 25 different species of invertebrates, including numerous vestimentiferans and remarkably few mussels. Recorded temporal changes in vent fluid chemistry and temperature regimes, when coupled with microbiological characterization of the vent fluids and seismic activity data obtained from ocean bottom seismometers, shed considerable light on factors controlling biological community structure in these hydrothermal ecosystems.
    Description: Supported by NSF Grants OCE-9529819, ESI-0087679 (RAL), OCE-0327353 (RAL and CV), OCE-0327261, OCE-0451983 (TS), MCB-0456676, CHE-0221978 (CV), OCE-0326434 (GWL), and OCE-0327283 (MT), the Deep Ocean Exploration Institute at the Woods Hole Oceanographic Institution, and the New Jersey Agricultural Experiment Station at Rutgers University.
    Keywords: Hydrothermal vents ; Seismicity ; Voltammetry ; Vent chemistry ; Mussels
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 47
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    Recent seismicity and crustal stress field in the Lucanian Apennines and surrounding areas (Southern Italy): Seismotectonic implications (2009)
    Elsevier B.V.
    Details
    Publication Date: 2017-04-04
    Description: We analyzed the instrumental seismicity of Southern Italy in the area including the Lucanian Apennines and Bradano foredeep, making use of the most recent seismological data base available so far. P- and S-wave arrival times, recorded by the Italian National Seismic Network (RSNC) operated by the Istituto Nazionale di Geofisica e Vulcanologia (INGV), were re-picked along with those of the SAPTEX temporary array deployed in the region in the period 2001–2004. For some events located in the upper Val d'Agri, we also used data from the Eni-Agip oil company seismic network. We examined the seismicity occurred during the period between 2001 and 2006, considering 514 events with magnitudes M≥2.0. We computed the VP/VS ratio obtaining a value of 1.83 and we carried out an analysis for the one-dimensional (1D) velocity model that approximates the seismic structure of the study area. Earthquakes were relocated and, for well- recorded events, we also computed 108 fault plane solutions. Finally, using 58 solutions, the most constrained, we computed regional stress field in the study area. Earthquake distribution shows three main seismic regions: the westernmost (Lucanian Apennines) characterized by high background seismicity, mostly with shallow hypocenters, the easternmost below the Bradano foredeep and the Murge with deeper and more scattered seismicity, and finally the more isolated and sparse seismicity localized in the Sila Range and in the offshore area along the northeastern Calabrian coast. Focal mechanisms computed in this work are in large part normal and strike-slip solutions and their tensional axes (T-axes) have a generalized NE–SW orientation. The denser station coverage allowed us to improve hypocenters determination compared to those obtained by using only RSNC data, for a better characterization of the crustal and subcrustal seismicity in the study area.
    Description: Published
    Description: 130-144
    Description: 3.2. Tettonica attiva
    Description: 5.7. Consulenze in favore di istituzioni nazionali e attività nell'ambito di trattati internazionali
    Description: JCR Journal
    Description: reserved
    Keywords: Lucanian Apennines ; Southern Italy ; Seismicity ; 1D velocity model ; Focal mechanisms ; Stress field ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
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  • 48
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    Seismicity, seismotectonics and crustal velocity structure of the Messina Strait (Italy) (2009)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: The Messina Strait is the most important structural element interrupting the southernmost part of the Alpine-Apenninic orogenic belt, known as the Calabro-Peloritan Arc. It is being a narrow fan-shaped basin linking the Ionian Sea to the Tyrrhenian Sea. This region is affected by considerable seismic activity which mirrors the geodynamic processes due to the convergence between the African and the Eurasian plates. In the last four centuries, a significant number of disastrous earthquakes originated along the Arc. Among these, the most noteworthy event occurred on December 28, 1908 (known as the Reggio Calabria-Messina earthquake), in the Messina Strait area and caused a large tsunami and more than 100,000 casualties. In this research we focus on the relationships between the general tectonic setting, which characterize the Messina Strait and adjacent areas, seismicity patterns and the crustal structure. We analyzed a data set consisting of more than 300 events occurring in the years from 1999 to 2007, having a magnitude range from 1.0 to 3.8. This data set was exploited in a local earthquake tomography, by carrying out a simultaneous inversion of both the three-dimensional velocity structure and the distribution of seismic foci. We applied the “tomoADD” algorithm, which uses a combination of absolute and differential arrival times and a concept of self-adapting grid geometry, accounting for ray density encountered across the volume. With this method the accuracy of event locations is improved and velocity structure near the source region is resolved in more detail than standard tomography. Fault plane solutions were obtained for the major and best-recorded earthquakes. The obtained velocity images highlight vertical and lateral heterogeneities that can be associated with structural features striking from NNE-SSW to NE-SW. These results are consistent with important tectonic elements visible at the surface and the pattern delineated by earthquake locations and focal mechanisms.
    Description: Published
    Description: 65-78
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: Crustal structure ; Focal mechanism ; Seismicity ; Seismotectonics ; Tomography ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
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  • 49
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    Seismotectonic Information System of the Sicily Region (2009)
    Details
    Publication Date: 2017-04-04
    Description: General coordination: Giuseppe Vilardo. Database GIS: Rosa Nappi, Eliana Bellucci Sessa, Giuseppe Vilardo. WEB GIS: Giovanni Bronzino.
    Description: The Seismotectonic Information System of the Sicily Region is oriented to the production ad dissemination of scientific and technical information for seismotectonic applications in this highly active geo-dynamics region. This work was initially supported by A.S.I.-A.R.S.
    Description: Published
    Description: 5.5. TTC - Sistema Informativo Territoriale
    Description: open
    Keywords: Sicilia ; Seismotectonics ; Seismicity ; Faults ; 05. General::05.09. Miscellaneous::05.09.99. General or miscellaneous
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  • 50
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    Installazione di 5 stazioni digitali a larga-banda sull’isola di vulcano: un contributo alla conoscenza della sismicità superficiale della fossa (2009)
    INGV
    Details
    Publication Date: 2020-02-24
    Description: Earthquakes beneath Vulcano (Aeolian Island, Italy) are associated with fracturing (single events and sporadic swarms of low magnitude) or related to processes of the geothermal system (Montalto, 1994). This latter processes is responsible for most of the background activity, which is represented by weak events originating at shallow depth under the La Fossa cone (H〈1.5 Km below sea level). In order to improved the Permanent Seismic Network (PSN) run by Catania Section of Istituto Nazionale di Geofisica e Vulcanologia (INGV-CT) by installing additional 5 broad-band stations surrounding the La Fossa crater, to. In particular, on November 2005 along the north rim of La Fossa cone, 3 digital stations were installed with an array configuration; thereafter, in spring 2007 another two stations were installed at the southern base of the cone. All the stations are currently in continual transmission with Lipari Observatory. We considered about 1200 micro-earthquakes recorded from January 2004 to July 2007 associated with fluid dynamics processes. Studying 1007 of these events, six classes of events have been recognized by visual inspection, spectral and cross correlation analyses. Three episodes of increasing occurrence accompanying geothermal and geochemical anomalies have been recorded during this time period. The improved seismic network allowed the location of 55 events with unprecedented resolution and to highlight a space distribution depending on the classes of events. The events are located in the central and south-oriental sector of the cone at 500-1000 meter b.s.l. depth and events of each class seem clustering in preferential sectors.
    Description: Published
    Description: 1-16
    Description: 1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
    Description: N/A or not JCR
    Description: open
    Keywords: Seismicity ; La Fossa ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
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  • 51
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    Seismological investigations in the Gioia Tauro Basin (southern Calabria, Italy) (2009)
    Details
    Publication Date: 2019-11-04
    Description: This study provides new seismological information to characterize the seismically active area of the Gioia Tauro basin (southern Calabria, Italy). Seismic activity recorded by a temporary network from 1985 to 1994 was analyzed for focal mechanisms, stress tensor inversion, P-wave seismic attenuation and earthquake source parameters estimation. Fault plane solutions of selected events showed a variety of different mechanisms, even if a prevalence of normal dip-slip solutions with prevalent rupture orientations occurring along ca. NE-SW directions was observed. Stress tensor inversion analysis disclosed a region governed mainly by a NW-SE extensional stress regime with a nearly vertical σ1. These results are consistent with the structure movements affecting the studied area and with geodetic data. Furthermore, evaluation of P-waves seismic attenuation and earthquake source parameters of a subset of events highlighted a strong heterogeneity of the crust and the presence of fault segments and/or weakened zones where great stress accumulation or long-rupture propagation are hindered.
    Description: Published
    Description: 769-799
    Description: 3.1. Fisica dei terremoti
    Description: JCR Journal
    Description: open
    Keywords: Southern Calabria ; Seismicity ; Stress tensor ; Attenuation ; Source parameters ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
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  • 52
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    The Grosmarin experiment (2008)
    Details
    Publication Date: 2021-06-25
    Description: The GROSMARIN (which stands for GrandROSMARIN) cruise is proposed by UMR Géosciences Azur (with fellow french and italian research groups). Its goals are to better characterize active structures along this zone and to assess the resulting seismic hazard in a sort of continuation with respect to the MALISAR experiment, which has already surveyed some active structures through shallow observations. The GROSMARIN cruise is in fact the necessary counterpart to characterize them at depth.
    Description: Published
    Description: Palazzo Congressi della Stazione Marittima, Trieste, Italy
    Description: open
    Keywords: Ligurian Sea ; Tomography ; Active seismology ; Seismicity ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 53
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    Verso una migliore conoscenza delle strutture del margine Ligure: il progetto GROSMARIN (2008)
    Details
    Publication Date: 2021-06-25
    Description: (English Abstract) The Ligurian margin, that is the junction area located between the Ligurian basin and the Southwestern Alps, is a passive margin, seismically active and subjected to gravitative movements. The active deformation in this sector is among the strongest ever experienced in Western Italy and Southern France. The current geodynamics of the basin is not completely understood yet, and somewhat under interest and debate of the scientific community. The latest results on the recent evolution of the Alps-Mediterranean system suggest that the area under study lay close to a domain under extension. The interest for the area is reinforced by its seismic activity that, although of low to moderate energy, acts in an area of high vulnerability. Some historical events involved in fact dramatic social and material damages. The growth of population (that now accounts for more than 2.500.000 inhabitants between Cannes and Genoa), the setting of numerous industries and the tourist business of the area are additional motivation for monitoring the area from the seismic point of view and especially to make specific studies on the seismogenic structures of this sector. Events with magnitude greater than 4.5 to 5.0 are in fact recorded every 5 years, but the area undergoes a rather weak microseismicity that often remains undetected and always poorly located by land seismic networks. The natural risks associated to this sector cannot neglect the presence of steep canyons that incise the offshore margin and favour gravitative slopes. The sediment masses accumulate on top of these canyons and may slip even after an earthquake of moderate magnitude. The GROSMARIN (which stands for GrandROSMARIN) cruise is proposed by UMR Géosciences Azur (with fellow french and italian research groups). It aims at (1) studying the microseismicity along a part of the northern margin of the Ligurian Basin, offshore France and Italy and (2) to realise a 3D tomography by wide-angle seismics. The goal is to better characterize active structures along this zone and to assess the resulting seismic hazard.
    Description: Published
    Description: 359-360
    Description: N/A or not JCR
    Description: open
    Keywords: Seismogenic structures ; Seismicity ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
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  • 54
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    Inverse and forward modelling of groundwater circulation in a seismically active area (Monferrato, Piedmont, NW Italy): Insights into stress-induced variations in water chemistry (2008)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: Reaction path modelling, coupled with preparatory inverse modelling, was applied to test this model's ability to reproduce the wide compositional range of ground waters circulating in a restricted area in Piedmont, Italy. This approach is based on the assumption that the chemistry of groundwater evolves through a series of partial equilibria with secondary minerals until it reaches its final composition. PHREEQC [Parkhurst, D.L., Appelo, C.A.J., 1999. User's guide to PHREEQC-A computer program for speciation, reaction-path, 1D-transport, and inverse geochemical calculations. U.S. Geological Survey Water-Resources Investigations Report, pp. 99-4259] and EQ3/6 [Wolery, T.J., Daveler, S.A., 1992. EQ6, A Computer Program for Reaction Path Modeling of Aqueous Geochemical Systems: Theoretical Manual, User's Guide and Related Documentation (version 7.0). Report UCRl-MA-110662 PT IV. Lawrence Livermore National Laboratory, Livermore, California] software packages were used to effect simulations. Reaction-path modelling was performed in time mode, taking into account the different rates of dissolution of each dissolving mineral. Data from literature regarding the kinetic parameters of dissolving minerals and the mineralogical composition of the host-rock were used. The results of the reaction-path modelling show that the composition of the analysed water samples was adequately reproduced, notwithstanding the hydrogeological complexity of the studied area. Modelling results provided very different water compositions as an effect of the chemical maturity, the physico-chemical parameters ( fCO2, fO2, and temperature) and the variable amounts of gypsum among dissolving rock-forming minerals, which occur in Miocene levels of the sedimentary sequence. Further variability is related to the occasional contribution of brackish waters trapped in euxinic marly sediments, locally sealed by overlying clays, that have assumed an artesian character. The composition of some of the water samples can only be predicted by simulation runs performed at a temperature higher than that of the outlet (40 °C). These warm waters probably circulate in a restricted area near the town of Nizza Monferrato. The same area has recently been affected by moderate seismicity, which has been accompanied by changes in either the temperature or chemistry, or both, of the ground waters. The changes recorded, interpreted as having been triggered by variations in the local/regional stress load and/or seismic activity, have to be ascribed to the vertical heterogeneity of the aquifers, where waters of different temperature, salinity and chemical composition circulate and occasionally mix.
    Description: Municipality of Nizza Monferrato (Asti, Italy) and the Regional Administration of Regione Piemonte (Italy)
    Description: Published
    Description: 14-39
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: JCR Journal
    Description: reserved
    Keywords: Reaction-path modelling ; EQ3/6 ; Inverse modelling ; Tertiary Piedmont Basin ; Monferrato ; Seismicity ; 03. Hydrosphere::03.04. Chemical and biological::03.04.03. Chemistry of waters
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  • 55
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    Seismicity and stress field in the Sannio-Matese area (2008)
    INGV
    Details
    Publication Date: 2017-04-04
    Description: In this study we discuss the available data on seismicity and focal mechanisms in the Sannio-Matese area in order to obtain information on the stress field acting in the area. Background seismicity of the area is characterized by isolated events, with magnitude generally less than 2.5, on which is superimposed a swarm and seismic sequence activity of low magnitude (max magnitude 4.1). The epicentral distribution of both isolated events and seismic sequences, disclose NE-SW striking active faults that fall in between the fault segments of the large historical earthquakes which occurred in the area. The available information on the stress field deducible from the focal mechanisms of the area agrees that a general extensional stress regime is acting. Locally both NE-SW and NNW-SSE extensions are observed. The large scale stress regime deduced from the focal mechanisms of strong instrumental earthquakes which occurred in the Apennines supports the local NE-SW extension but cannot explain the normal movements related to a NW-SE extension. The local longitudinal extension observed, supported by GPS data, can be explained utilizing large scale geodynamic models.
    Description: Published
    Description: 347-356
    Description: 3.1. Fisica dei terremoti
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: Seismicity ; Seismotectonics ; Geodynamics ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
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  • 56
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    A snapshot of the Northern Apennines (Italy) seismicity, merging catalogue and new seismic data (2008)
    Details
    Publication Date: 2017-04-04
    Description: In this paper we present the seismicity analysis of a small sector of the Northern Apennines in 27 terms of spatio-temporal distribution, merging data from the Italian seismic bulletin with new 28 data collected by temporal seismic networks. Our attention is focused on the region enclosed 29 between Toscana, Umbria, Marche and Emilia-Romagna. This area is mainly characterized by a 30 diffuse seismicity, partly clustered in small sequences (Mw 〈 4.7). Improved seismicity locations, 31 together with stress field analysis allows to characterize the manner of seismogenic stress release 32 in the area. Two regions of significantly different seismic release behavior could be 33 distinguished: (i) the inner/western part (Tuscan side) of the study area, where seismicity is 34 clustered at shallow depths (〈18 km) and where strong earthquakes occurred in the past, (ii) the 35 outer(eastern) part (Marche side), where the seismicity is diffuse across all of the crustal volume, 36 reaching depths of down to 30 km. 37 Along the Apenninic chain, seismicity is nearly absent inside well defined zones. In our opinion, 38 these peculiarities of seismicity release could be related to the heterogeneity of crustal volume 39 and to the transition between Tyrrhenian and Adriatic domains.
    Description: Submitted
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: JCR Journal
    Description: open
    Keywords: Alto Tiberina Fault ; Seismicity ; Northern Apennines ; focal mechanisms ; stress field ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution
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  • 57
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    The MOLE Drilling Project: Laboratory at Depth on an Active Fault in Central Italy (2008)
    Details
    Publication Date: 2017-04-04
    Description: Several fundamental questions concerning: i) the geophysical and geochemical processes controlling normal faulting and earthquake ruptures during moderate-to-large seismic events and ii) the low angle normal fault paradox, still need to be fully answered. In this work we aim to present an example of low angle normal fault (Alto Tiberina Fault) located in the Northern Apennines (Italy) showing conclusive evidence of its seismic activity. This fault is a likely target of an international project: the MOLE (Multidisciplinary Observatory and Laboratory of Experiments) Drilling project. Indeed, under the auspices of the International Continental Scientific Drilling Program a workshop is being organized in Italy next spring 2008, to promote the creation of an international multidisciplinary team of scientists, to discuss the project in detail and also to prepare a full proposal for ICDP. This project wants to investigate the inner structure of normal faults in Central Italy to get physical constraints on the processes controlling faulting and earthquake mechanics. The Umbria-Marche sector of Northern Apennines offers a unique opportunity to reach a complex system of normal faults among which we selected two possible targets. 1) The active Colfiorito fault dipping about 45° toward SW which Tiberina low angle normal fault dipping 15°-25° towards ENE, which moves through a combination of aseismic creep and repeating microearthquakes. Drilling the Colfiorito active fault at a depth of about 2-3 km allows targeting the high coseismic slip patch of the 1997 earthquake M=6 seismogenic structure. Drilling the Alto Tiberina Fault at a depth of nearly 5-6 km will target a micro seismicity source. We aim to collect new original data through borehole logging and sampling and to set up a permanent observatory at depth for a multidisciplinary monitoring to characterize these active normal fault zones. This will allow to understand how such faults behave and to create more realistic models of: earthquake nucleation, seismicity pattern, stress interactions and earthquake triggering at local and regional scale. Both drilling targets present relevant technical issues that should be discussed from different points of view before selecting the starting drilling site.
    Description: Published
    Description: San Francisco, CA (USA)
    Description: 3.2. Tettonica attiva
    Description: open
    Keywords: Drilling ; Alto Tiberina Fault ; Seismicity ; Stress ; North Apennines ; Central Italy ; LANF ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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    Tidal forcing on David Glacier and Drygalski Ice Tongue (2008)
    The National Academy Press, Washington DC
    Details
    Publication Date: 2017-04-04
    Description: During the 2005-06 Austral Summer, we carried out a joint observational campaign in the area of the David Glacier, South Victoria Land, with the aim of collecting simultaneous time series of geodetic and seismological data. We installed 7 temporary seismographic stations on rock outcrops surrounding the glacier and 3 temporary geodetic stations both on flowing ice and on rock. The seismic network registered a significant low-energy seismic activity, principally originated by ice creeping and basal stress at the interface between the ice and the bedrock. The geodetic stations allowed us to survey the glacier kinematics forced by the Ross Sea tides, and to infer the grounding line location. Here we show some details about data analysis and preliminary results.
    Description: Published
    Description: Santa Barbara, California
    Description: 1.8. Osservazioni di geofisica ambientale
    Description: reserved
    Keywords: Antarctica ; David Glacier ; Tidal force ; Geodetic observations ; Seismicity ; 02. Cryosphere::02.02. Glaciers::02.02.05. Ice dynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Extended abstract
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  • 59
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    Seismotectonic analysis of a complex fault system in Italy: the "Garfagnana-North" (Northern Tuscany) line (2007)
    Details
    Publication Date: 2017-04-04
    Description: We present the results obtained combining different techniques to determine the seismotectonic character of the Garfagnana region (northern Tuscany). There, the existence of a rather complex fault system is acknowledged and somewhat mapped, but apart from the geological evidences, very little is known about its extension with depth and the regime. The seismic potential of the system is also well known. The area was characterized, in the past, by destructive earthquakes; in particular a major event (Ms=6.4) struck the Lunigiana-Garfagnana area in September 1920, but many others have been reported. Therefore, the seismicity is under constant monitoring by the national seismic network (RSNC – National Central Seismic Network) and a pool of local stations, belonging to a regional network (RSLG – Regional Seimic network of Lunigiana and Garfagnana). These additional stations account for the lower magnitude seismicity. Such a concentration of seismic stations, and the consequent availability of several seismograms, makes likely to record and localize earthquakes down to a very low magnitude threshold (inferior to Ml = 2.0) with extremely narrow hypocentral parameter errors . Making use of the resulting databases, several analyses were conducted to determine the shape, size, extension with depth of the fault and the associated seismicity. The methodology consists in seismic tomography (1D and 3D velocity models), precise location algorithms NonLinLoc and HypoDD (very constrained and reliable locations) and computation of focal mechanisms (fault orientation and source), all combined with the constraints provided by the geology. The main findings of the study are that the concentration of the recent seismic activity is close to the likely location of the most relevant historical events. In particular the earthquakes are distributed along a plane in the range 0 – 20 km depth dipping 30° NE. All focal mechanisms show a transtensive character.
    Description: Published
    Description: 131-133
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: partially_open
    Keywords: Seismicity ; tomography ; focal mechanism ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution
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    Seismicity of the upper lithosphere and its relationships with the crust in the italian region (2007)
    Details
    Publication Date: 2017-04-03
    Description: In a recent paper we compared the earthquake hypocenters, plotted according to updated catalogs, with the structure of the earth’s Crust interpreted after the results of seismic exploration (mainly the Deep Seismic Soundings – DSS). The comparison was made along several cross sections in the Alpine range, the Italian Peninsula and the surrounding seas. The main conclusions of this analysis were that 1) the majority of the events is positioned in the upper, rigid crust and 2) the earthquakes tend to concentrate above the discontinuities unveiled by the seismic exploration in the deep crust and at the Moho boundary. With the goal to shed some light on the continuation of these structures with depth, in this paper a similar analysis is conducted even in volumes where DSS information are not available. It is apparent that the upper mantle seismicity is very unevenly distributed; therefore we only focus on the areas where a sub-crustal seismicity is recorded, adding to the seismic models of the crust some information, if available, on the physical characters of the upper Lithosphere. Four areas are examined: the well known Calabrian (Aeolian) Arc where the Ionian plate is subducted beneath the Tyrrhenian, thin crust of oceanic type, the active subduction of the slab being witnessed by deep and very deep earthquakes; the north-central Apennines where the continental crust of the Adria microplate seems also subducted beneath the transitional, peri-Tyrrhenian type of crust but where the observed hypocenters are limited to the depth of about 100 km; the northern Apennines, where the same type of subduction seems to occur beneath the north-eastern slope of the mountain range, though evidenced by an even smaller number of events; finally, the western Alps: also here a small group of foci are recorded in the upper Mantle beneath the southern end of the “Ivrea body”. The different behavior of deep seismicity in the four areas confirms that the Italian peninsula is formed of sectors deriving from different geodynamical processes.
    Description: Published
    Description: 99-114
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: JCR Journal
    Description: partially_open
    Keywords: Seismicity ; Lithosphere, crustal structure ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
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    The Italian CMT dataset from 1977 to present (2007)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: The INGV-Harvard European-Mediterranean Regional Centroid Moment Tensor (RCMT) Catalog collects solutions routinely computed since 1997 for earthquakes with moderate magnitude (4.5 ≤ M ≤ 5.5) in the Mediterranean region. The database represents an extension to smaller magnitudes of the Harvard global CMT catalog, based on analysis of seismograms recorded at regional distance, and modeling of intermediate period surface waves. The catalog includes about 600 events, 200 of which in the Italian region. This study extends the catalog back in time, for the Italian region, as long as made possible by available digital data – i.e. since 1977 – with the same analysis and inversion method used for current seismicity. As a result, we present here 65 new moment tensors, for years between 1977 and 1997. These solutions represent 45% of the total number of events analyzed, the existing seismograms being often too scarce to allow a stable solution. The new dataset includes events in many seismic zones where moderate seismicity had previously been scarcely documented, e.g., the Po Plain, the Central to Southern Apennines and the Adriatic Sea. The complete dataset, including previously determined RCMTs and CMTs, represents the seismic deformation in the Italian area during the last 25 years.
    Description: Published
    Description: 286-303
    Description: JCR Journal
    Description: reserved
    Keywords: Seismicity ; Moment tensors ; Seismic deformation ; Italian region ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
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  • 62
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    Inverse and forward modelling of groundwater circulation in a seismically active area (Monferrato, Piedmont, NW Italy): insights into stress-induced variations in water chemistry (2007)
    Details
    Publication Date: 2017-04-04
    Description: Reaction path modelling, coupled with preparatory inverse modelling, was applied to test this model’s ability to reproduce the wide compositional range of ground waters circulating in a restricted area in Piedmont, Italy. This approach is based on the assumption that the chemistry of groundwater evolves through a series of partial equilibria with secondary minerals until it reaches its final composition. PHREEQC (Purkhurst and Appelo, 1999) and EQ3/6 (Wolery and Daveler, 1992) software packages were used to effect simulations. Reaction-path modelling was performed in time mode, taking into account the different rates of dissolution of each dissolving mineral. Data from literature regarding the kinetic parameters of dissolving minerals and the mineralogical composition of the host-rock were used. The results of the reaction-path modelling show that the composition of the analysed water samples was adequately reproduced, notwithstanding the hydrogeological complexity of the studied area. Modelling results provided very different water compositions as an effect of the chemical maturity, the physico-chemical parameters (fCO2, fO2, and temperature) and the variable amounts of gypsum among dissolving rock-forming minerals, which occur in Miocene levels of the sedimentary sequence. Further variability is related to the occasional contribution of brackish waters trapped in euxinic marly sediments, locally sealed by overlying clays, that have assumed an artesian character. The composition of some of the water samples can only be predicted by simulation runs performed at a temperature higher than that of the outlet (40°C). These warm waters probably circulate in a restricted area near the town of Nizza Monferrato. The same area has recently been affected by moderate seismicity, which has been accompanied by changes in either the temperature or chemistry, or both, of the ground waters. The changes recorded, interpreted as having been triggered by variations in the local/regional stress load and/or seismic activity, have to be ascribed to the vertical heterogeneity of the aquifers, where waters of different temperature, salinity and chemical composition circulate and occasionally mix.
    Description: In press
    Description: 2.4. TTC - Laboratori di geochimica dei fluidi
    Description: JCR Journal
    Description: open
    Keywords: reaction-path modelling ; EQ3/6 ; Inverse modelling ; Tertiary Piedmont Basin ; Monferrato ; Seismicity ; 03. Hydrosphere::03.01. General::03.01.01. Analytical and numerical modeling
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Late Quaternary kinematics, slip-rate and segmentation of a major Cordillera-parallel transcurrent fault: The Cayambe-Afiladores-Sibundoy system, NW South America (2007)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: We describe the recent activity of the Cayambe-Afiladores-Sibundoy Fault (CASF) and recognise it as one of the major potential active structures of northwestern South America, based on field observations, stereoscopic aerial photos of offset late Pleistocene-Holocene deposits and landforms, and crustal seismic activity. The CASF runs for at least 270 km along the sub-Andean zone of northern Ecuador and southern Colombia. We measured systematic latest Pleistocene-Holocene right-lateral strike-slip motion and right-lateral reverse motion consistent with earthquake focal mechanism solutions, and estimated a 7.7 +/- 0.4 to 11.9 +/- 0.7 mm/yr slip-rate. Magnitudes of the earthquakes that could be generated by possible fault-segment reactivation range up to M 7.0 +/- 0.1. The CASF should be considered as a major source of possible future large magnitude earthquakes, presenting a seismic hazard for the densely populated regions to the west. The CASF is part of the tectonic boundary of the North Andean block escaping NNE-wards with respect to the stable South American plate.
    Description: Published
    Description: 664-680
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: reserved
    Keywords: Active fault ; Seismicity ; Slip-rate calculation ; Colombia ; Ecuador ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology
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    An Improved Method for the Recognition of Seismic Families: Application to the Garfagnana-Lunigiana Area, Italy (2007)
    Seismological Society of America
    Details
    Publication Date: 2017-04-04
    Description: With the aim to find a more objective way to detect seismic families, we applied a series of successive steps to constrain the results of a waveform similarity analysis. The evaluation of similarity was carried out on the waveforms recorded in the period 1999–2003 by the stations operating in the Garfagnana area, located in northern Tuscany (Italy). The algorithm is based on the cross-correlation technique applied in a process that overcomes the limit of one order of magnitude between events to be compared through a bridging technique. In practice, if two couples of events (A, B) and (B, C), each exceeding the correlation threshold, share a common quake (B), then all three events are attributed to the same family even if the match between A and C is below a value chosen as a reference for similarity. To avoid any subjective choice of threshold for cross-correlation values, the results from the computation algorithm are submitted to a routine that gives increasing reliability to them if they are confirmed by the three components of the seismogram and if the number of families detected by each station is confirmed by more recordings. This latter constraint is made possible by the geometry of the recording network, with interdistances between stations of the order of 40–50 km. The process finally leads to the recognition of 27 families detected and confirmed by, on average, 3 stations that represent 40% of the recording capabilities. Since the performances of the recording network have been very odd in the past, especially in the early years of operation, the reliability of the detection is much higher, as in most cases the stations that detected the families were the only ones to be effectively recording. The methodology proved to be more efficient than other methods applied in the past; moreover, the results could be probably improved even more if, instead of doing a one-run process, it would be borne as a trial-and-error approach.
    Description: Published
    Description: 1903-1915
    Description: JCR Journal
    Description: reserved
    Keywords: Seismicity ; multiplets ; seismic families ; seismic sequences ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
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    European-Mediterranean regional centroid-moment tensor catalog: solutions for years 2001 and 2002 (2006)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: We present regional centroid-moment tensor (RCMT) solutions for 168 moderate-magnitude earthquakes that occurred in the European-Mediterranean region during 2001 and 2002. Events with moment magnitudes as low as 4.0 were successfully analyzed, although this low threshold is only achievable in regions with the best azimuthal coverage and with stations at a few hundred kilometers distance. Earthquakes with focal depths from 10 to more than 200 km were analyzed. Comparison with standard Harvard CMTs, when available, shows good agreement. The solutions shown in this paper represent an addition to the European-Mediterranean RCMT catalog that we are maintaining. The RCMT catalog now spans 6 years, from 1997 to 2002, and contains 420 solutions. We also outline the main seismic sequences that occurred in the European-Mediterranean region during 2001–2002.
    Description: MedNet Data Centre ORFEUS-MEREDIAN GEOFON IRIS
    Description: Published
    Description: 127-147
    Description: reserved
    Keywords: Seismicity ; Seismic moment tensors ; European-Mediterranean region ; 05. General::05.02. Data dissemination::05.02.02. Seismological data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 66
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    Geochemical monitoring of thermal waters in Slovenia: relationships to seismic activity (2006)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: Thermally anomalous fluids released in seismic areas in Slovenia were the subjects of geochemical monitoring. Thermal waters were surveyed from the seismically active area of Poso$cje (Bled and Zatolmin; NW Slovenia) and from Rogaska Slatina in eastern Slovenia. Continuous monitoring of geochemical parameters (radon concentration, electrical conductivity, and water temperature) was performed with discrete gas sampling for their 3He/4He ratio. The observed values were correlated with meteorological parameters (rainfall, barometric pressure and air temperature) and with seismic activity. Only a few earthquakes occurred in the vicinity of the measuring sites during the monitoring period. Nevertheless, changes in radon concentration, water temperature, electrical conductivity and helium isotopic ratio were detected at the three thermal springs in the periods preceding the earthquakes. A close correlation was also observed of both water temperature and electrical conductivity with the Earth tide, making the observations in the selected sites a promising tool for addressing the widely debated question of earthquake prediction.
    Description: Ministry of Education,Science and Sport of Slovenia
    Description: Published
    Description: 919–930
    Description: partially_open
    Keywords: Seismicity ; Thermal waters ; Geochemistry ; 03. Hydrosphere::03.02. Hydrology::03.02.02. Hydrological processes: interaction, transport, dynamics ; 03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring
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    Some preliminary results of a worldwide seismicity estimation: a case study of seismic hazard evaluation in South America (2006)
    Details
    Publication Date: 2019-11-04
    Description: Global data have been widely used for seismicity and seismic hazard assessment by seismologists. In the present study we evaluate worldwide seismicity in terms of maps of maximum observed magnitude (Mmax), seismic moment (M 0 ) and seismic moment rate (M 0S). The data set used consists of a complete and homogeneous global catalogue of shallow (h £ 60 km) earthquakes of magnitude MS ³ 5.5 for the time period 1894-1992. In order to construct maps of seismicity and seismic hazard the parameters a and b derived from the magnitude-frequency relationship were estimated by both: a) the least squares, and b) the maximum likelihood, methods. The values of a and b were determined considering circles centered at each grid point 1° (of a mesh 1° ´1°) and of varying radius, which starts from 30 km and moves with a step of 10 km. Only a and b values which fulfill some predefined conditions were considered in the further procedure for evaluating the seismic hazard maps. The obtained worldwide M max distribution in general delineates the contours of the plate boundaries. The highest values of M max observed are along the circum-Pacific belt and in the Himalayan area. The subduction plate boundaries are characterized by the largest amount of M 0 , while areas of continental collision are next. The highest values of seismic moment rate (per 1 year and per equal area of 10 000 km 2) are found in the Southern Himalayas. The western coasts of U.S.A., Northwestern Canada and Alaska, the Indian Ocean and the eastern rift of Africa are characterized by high values of M 0 , while most of the Pacific subduction zones have lower values of seismic moment rate. Finally we analyzed the seismic hazard in South America comparing the predicted by the NUVEL1 model convergence slip rate between Nazca and South America plates with the average slip rate due to earthquakes. This consideration allows for distinguishing between zones of high and low coupling along the studied convergence plate boundary.
    Description: JCR Journal
    Description: open
    Keywords: Seismicity ; maximum observed magnitude ; seismic moment ; seismic momente rate ; V3/V1 ; V1-.V3 ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
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    Comparison of frequency of occurrence of earthquakes with slip rates from long-term seismicity data: the cases of Gulf of Corinth, Sea of Marmara and Dead Sea fault zone (2006)
    In:  Geophysical Journal International, Luxembourg, EGS-Gauthier-Villars, vol. 165, no. 2, pp. 516-526, pp. 2214
    Details
    Publication Date: 2006
    Keywords: Seismicity ; Recurrence of earthquakes ; Greece ; Israel ; Jordan ; Turkey ; Fault zone ; NAF ; DSTF ; earthquake, ; historical ; seismicity, ; slip ; rates ; GJI
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  • 69
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    Fault-perpendicular aftershock clusters following the 2003 Mw = 5.0 Big Bear, California, earthquake (2006)
    In:  Geophys. Res. Lett., Taipei, Elsevier, vol. 33, no. 7, pp. 1144-1157, pp. L07301, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 2006
    Keywords: Stress ; Coulomb ; Seismicity ; Aftershocks ; triggering ; SAF ; Fault zone ; USA ; GRL ; 7209 ; Seismology: ; Earthquake ; dynamics ; (1242) ; 7215 ; Earthquake ; source ; observations ; (1240) ; 7223 ; Earthquake ; interaction, ; forecasting, ; and ; prediction ; (1217, ; 1242) ; 7230 ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242) ; 8015 ; Structural ; Geology: ; Local ; crustal ; structure
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    Seismic-hazard assessment for a characteristic earthquake scenario: an integrated probabilistic-deterministic method (2006)
    In:  Bulletin of the Seismological Society of America, Roma, Publicazioni dell'Istituto Nazionale di Geofisica, vol. 96, no. 2, pp. 377-391, pp. 2128, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 2006
    Keywords: Seismology ; Earthquake hazard ; Gutenberg-Richter magnitude frequency b-value ; Magnitude ; Seismicity ; PSHA ; DSHA ; BSSA
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    The absence of remotely triggered seismicity in Japan (2006)
    In:  Bulletin of the Seismological Society of America, Münster, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 96, no. 3, pp. 871-878, pp. B04310, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 2006
    Keywords: Seismology ; Seismicity ; long ; distance ; Stress ; BSSA
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    Search for reliable precursors: A case study of the seismic quiescence of the 2000 western Tottori prefecture earthquake (2006)
    In:  J. Geophys. Res., Taipei, Ges. f. Geowissenschaften e.V., vol. 111, no. B4, pp. 19-1 to 19-4, pp. B04301, (ISSN 0343-5164)
    Details
    Publication Date: 2006
    Keywords: Earthquake precursor: prediction research ; Earthquake precursor: statistical anal. of seismicity ; Statistical investigations ; Seismicity ; Japan ; JGR ; precursors ; earthquakes ; risk ; alarm ; 7223 ; Seismology: ; Earthquake ; interaction, ; forecasting, ; and ; prediction ; (1217, ; 1242) ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242) ; 7209 ; Earthquake ; dynamics ; (1242) ; 8123 ; Tectonophysics: ; Dynamics: ; seismotectonics
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    Static Coulomb failure function and aftershocks of 1995 Kobe earthquake: A statistical test (2006)
    In:  Geophys. Res. Lett., Amsterdam, Univ. Tokyo, vol. 33, no. 17, pp. 551-557, pp. L17313, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Stress ; Aftershocks ; Earthquake ; Statistical investigations ; CFF ; GRL ; 7209 ; Seismology: ; Earthquake ; dynamics ; (1242) ; 7212 ; Earthquake ; ground ; motions ; and ; engineering ; seismology ; 7223 ; Earthquake ; interaction, ; forecasting, ; and ; prediction ; (1217, ; 1242) ; 7230 ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242)
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    Testing earthquake prediction methods: "The West Pacific short-term forecast of earthquakes with magnitude MwHRV = 5.8" (2006)
    In:  Tectonophysics, Warszawa, Conseil de l'Europe, vol. 413, no. 1-2, pp. 25-31, pp. L10608, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Earthquake precursor: prediction research ; Seismicity ; Earthquake precursor: statistical anal. of seismicity ; Error analysis ; Probabilistic ; forecasting ; Earthquake ; prediction ; Null-hypothesis ; Confidence ; level ; Prediction ; efficiency
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    Bathymetric survey images structure off Sumatra (2006)
    In:  Eos Trans. AGU, Basel, Elsevier Science Publishers, vol. 87, no. 17, pp. 165,168, pp. 1025, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Sea seismics, ; Earthquake, ; Banda, ; Aceh, ; Nias, ; Project report/description ; Fluh ; Gadicke ; 3045 ; Marine ; Geology ; and ; Geophysics: ; Seafloor ; morphology, ; geology, ; and ; geophysics ; 3060 ; Subduction ; zone ; processes ; 7230 ; Seismology: ; Seismicity ; and ; tectonics
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    Earthquakes: A hand on the aftershock trigger (2006)
    In:  Nature, San Francisco, Pergamon, vol. 441, no. 7094, pp. 704-705, pp. 1447, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Stress ; Coulomb ; Aftershocks ; Dynamic ; Friction ; Seismicity ; Rheology
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    Seismic imaging of the aftershock zone of the 2001 Mw 7.7 Bhuj earthquake, India (2006)
    In:  Geophys. Res. Lett., Ottawa, 3-4, vol. 33, no. 5, pp. 633-649, pp. L05309, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Aftershocks ; Earthquake ; Body waves ; P-waves ; Shear waves ; Velocity depth profile ; Tomography ; GRL ; 7209 ; Seismology: ; Earthquake ; dynamics ; (1242) ; 7205 ; Continental ; crust ; (1219) ; 7290 ; Computational ; seismology ; 7270 ; Tomography ; (6982, ; 8180) ; 7230 ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242)
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    Earthquake triggering by migrating slow slip initiated by M8 earthquake along Kuril Trench, Japan (2006)
    In:  Geophys. Res. Lett., Dordrecht, Netherlands, Dr. W. Junk, vol. 33, no. 9, pp. 1-4, pp. L09306, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: red ; silent ; Earthquake ; Subduction zone ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; GRL ; 7207 ; Geodesy ; and ; Gravity: ; Transient ; deformation ; 1240 ; Satellite ; geodesy: ; results ; 1242 ; Seismic ; cycle ; related ; deformations ; 7223 ; Seismology: ; Earthquake ; interaction, ; forecasting, ; and ; prediction ; 7230 ; Seismicity ; and ; tectonics
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    Earthquake scaling: the effect of a viscoelastic asthenosphere (2006)
    In:  Geophysical Journal International, Oxford and Edinburgh, Blackwell Scientific Publications, vol. 166, no. 1, pp. 170-178, pp. 1484, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 2006
    Keywords: Rheology ; Inelastic ; Gutenberg-Richter magnitude frequency b-value ; Magnitude ; Seismicity ; Statistical investigations ; Dislocation ; Three dimensional ; Modelling ; GJI ; fault ; slip ; synthetic-earthquake ; catalogues ; viscoelasticity
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    A growing structure near the deformation front in SW Taiwan as deduced from SAR interferometry and geodetic observation (2006)
    In:  Geophys. Res. Lett., Taipei, Ges. f. Geowissenschaften e.V., vol. 33, no. 12, pp. 1-5, pp. L12305, (ISSN 0343-5164)
    Details
    Publication Date: 2006
    Keywords: Structural geology ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Seismicity ; Tectonics ; China ; InSAR ; Geodesy ; GRL ; 1209 ; Geodesy ; and ; Gravity: ; Tectonic ; deformation ; 1240 ; Satellite ; geodesy: ; results ; 1243 ; Space ; geodetic ; surveys
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    Imaging the seismic structure and stress field in the source region of the 2004 mid-Niigata prefecture earthquake: Structural zones of weakness and seismogenic stress concentration by ductile flow (2006)
    In:  J. Geophys. Res., Amsterdam, Univ. Tokyo, vol. 111, no. B8, pp. 1-18, pp. B08308, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Tomography ; Seismics (controlled source seismology) ; Stress ; Earthquake ; Rheology ; Japan ; JGR ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; 7270 ; Tomography ; 8164 ; Tectonophysics: ; Stresses: ; crust ; and ; lithosphere ; 8012 ; Structural ; Geology: ; High ; strain ; deformation ; zones ; 8015 ; Local ; crustal ; structure
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  • 82
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    Geometrical impact of the San Andreas Fault on stress and seismicity in California (2006)
    In:  Geophys. Res. Lett., Amsterdam, 4, vol. 33, no. 8, pp. 1-4, pp. L08302, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Structural geology ; Fault zone ; SAF ; USA ; Seismicity ; Stress ; GRL ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; 8031 ; Structural ; Geology: ; Rheology: ; crust ; and ; lithosphere ; 8020 ; Mechanics, ; theory, ; and ; modeling ; 8111 ; Tectonophysics: ; Continental ; tectonics: ; strike-slip ; and ; transform ; 8118 ; Dynamics ; and ; mechanics ; of ; faulting
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  • 83
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    Resonant slow fault slip in subduction zones forced by climatic load stress (2006)
    In:  Nature, Stuttgart, Pergamon, vol. 442, no. 7104, pp. 802-805, pp. L13613, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Global Positioning System ; climate ; Time series analysis ; Subduction zone ; silent ; red ; Seismicity
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  • 84
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    Can coseismic stress variability suppress seismicity shadows? Insights from a rate-and-state friction model (2006)
    In:  J. Geophys. Res., Zagreb, 3-4, vol. 111, no. B6, pp. 1-11, pp. B06305, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Stress ; Coulomb ; Seismicity ; Friction ; Rock mechanics ; JGR ; earthquake ; triggering ; stress ; heterogeneity ; rate ; and ; state ; friction ; 7209 ; Seismology: ; Earthquake ; dynamics ; 7215 ; Earthquake ; source ; observations ; 7223 ; Earthquake ; interaction, ; forecasting, ; and ; prediction
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    Uplift and subsidence associated with the great Aceh-Andaman earthquake of 2004 (2006)
    In:  J. Geophys. Res., Hannover, Conseil de l'Europe, vol. 111, no. B2, pp. 2160-2186, pp. B02407, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Earthquake ; Indonesia ; Geodesy ; Seismicity ; Subduction zone ; JGR ; satellite ; imagery ; coral ; reef ; Sumatra ; 1209 ; Geodesy ; and ; Gravity: ; Tectonic ; deformation ; (6924) ; 1243 ; Space ; geodetic ; surveys ; 4220 ; Oceanography: ; General: ; Coral ; reef ; systems ; (4916) ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242) ; 7240 ; Subduction ; zones ; (1207, ; 1219, ; 1240)
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    Coseismic surface deformation from air photos: The Kickapoo step over in the 1992 Landers rupture (2006)
    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 111, no. B3, pp. ETG 2-1 to ETG 2-6, pp. B03408, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Geodesy ; Fault zone ; JGR ; earthquake ; slip ; distribution ; USA ; California ; 1209 ; Geodesy ; and ; Gravity: ; Tectonic ; deformation ; (6924) ; 1241 ; Satellite ; geodesy: ; technical ; issues ; (6994, ; 7969) ; 1640 ; Global ; Change: ; Remote ; sensing ; (1855) ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242) ; 8164 ; Tectonophysics: ; Stresses: ; crust ; and ; lithosphere
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    Short-term slow slip and correlated tremor episodes in the Tokai region, central Japan (2006)
    In:  Geophys. Res. Lett., Hannover, Conseil de l'Europe, vol. 33, no. 17, pp. 25-1 to 25-4, pp. L17311, (ISSN 0343-5164)
    Details
    Publication Date: 2006
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Micro-tremor (seismic noise) ; Subduction zone ; red ; silent ; Seismicity ; GRL ; 1207 ; Geodesy ; and ; Gravity: ; Transient ; deformation ; (6924, ; 7230, ; 7240) ; 1242 ; Seismic ; cycle ; related ; deformations ; (6924, ; 7209, ; 7223, ; 7230) ; 7240 ; Seismology: ; Subduction ; zones ; (1207, ; 1219, ; 1240) ; 8170 ; Tectonophysics: ; Subduction ; zone ; processes ; (1031, ; 3060, ; 3613, ; 8413) ; 9320 ; Geographic ; Location: ; Asia
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    Opinion: Earthquake predictability, brick by brick (2006)
    In:  Seism. Res. Lett., Reykjavík, Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 77, no. 1, pp. 3-6, pp. TC1011, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 2006
    Keywords: Seismology ; Earthquake precursor: prediction research ; Stress ; Coulomb ; Modelling ; Seismicity ; red ; silent ; slow ; tremor ; Subduction zone ; Source ; Fault plane solution, focal mechanism ; Moment tensor ; Seismic networks ; Data analysis / ~ processing ; SRL
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    Correlation between the phase of the moon and the occurrences of microearthquakes in the Tamba region through point-process modeling (2006)
    In:  Geophys. Res. Lett., Amsterdam, Schweizerbart'sche Verlagsbuchhandlung, vol. 33, no. 7, pp. 165-177, pp. L07302, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 2006
    Keywords: Seismicity ; TIDES ; Modelling ; Earthquake ; Kobe ; Japan ; GRL ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242) ; 7270 ; Tomography ; (6982, ; 8180)
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    Comment on 'Testing earthquake prediction methods: "The West Pacific short-term forecast of earthquakes with magnitude MwHRV = 5.8"' by V.G. Kossobokov (2006)
    In:  Tectonophysics, London, Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 413, no. 1-2, pp. 33-38, pp. B02206, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 2006
    Keywords: Earthquake precursor: prediction research ; Seismicity ; Earthquake precursor: statistical anal. of seismicity ; Error analysis ; Probabilistic ; forecasting ; Earthquake ; prediction ; Null-hypothesis ; Confidence ; level ; Prediction ; efficiency
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    Spatial-temporal patterns of seismic tremors in northern Cascadia (2006)
    In:  J. Geophys. Res., Amsterdam, Elsevier Scientific Publishing Company, vol. 111, no. B3, pp. 841-844, pp. B03309, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Seismicity ; Subduction zone ; Earthquake precursor: prediction research ; Statistical investigations ; JGR ; episodic ; tremor ; and ; slip ; source-scanning ; algorithm ; 1242 ; Geodesy ; and ; Gravity: ; Seismic ; cycle ; related ; deformations ; (6924, ; 7209, ; 7223, ; 7230) ; 8164 ; Tectonophysics: ; Stresses: ; crust ; and ; lithosphere ; 8170 ; Subduction ; zone ; processes ; (1031, ; 3060, ; 3613, ; 8413) ; 7240 ; Seismology: ; Subduction ; zones ; (1207, ; 1219, ; 1240) ; 9350 ; Geographic ; Location: ; North ; America ; Canada ; ETS
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  • 92
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    Seismic triggering of eruptions in the far field: volcanoes and geysers (2006)
    In:  Ann. Rev. Earth Planet. Sci., Ottawa, 3-4, vol. 34, no. 5, pp. 263-291, pp. 1214, (ISSN: 1340-4202)
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    Publication Date: 2006
    Keywords: Volcanology ; remote ; long ; distance ; Stress ; Seismicity ; ANREV
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  • 93
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    Stability regimes of a dilatant, fluid-infiltrated fault plane in a three-dimensional elastic solid (2006)
    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 111, no. B8, pp. 1-22, pp. B08304, (ISSN 0343-5164)
    Details
    Publication Date: 2006
    Keywords: Fault zone ; Rock mechanics ; Three dimensional ; rate ; state ; Friction ; hydraulic ; Physical properties of rocks ; JGR ; 5114 ; Physical ; Properties ; of ; Rocks: ; Permeability ; and ; porosity ; 4445 ; Nonlinear ; Geophysics: ; Nonlinear ; differential ; equations ; 3653 ; Mineralogy ; and ; Petrology: ; Fluid ; flow ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; 0545 ; Computational ; Geophysics: ; Modeling
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    New insights into the mechanism of postseismic stress relaxation exemplified by the 23 June 2001 M[w] = 8.4 earthquake in southern Peru (2006)
    In:  Geophys. Res. Lett., Zagreb, Conseil de l'Europe, vol. 33, no. 2, pp. 441-445, pp. L02307, (ISSN 0343-5164)
    Details
    Publication Date: 2006
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Stress ; Rheology ; Non-linear effects ; Maxwell ; Two-dimensional ; Finite Element Method ; Modelling ; Earthquake ; South ; America ; GIK ; GRL ; 1207 ; Geodesy ; and ; Gravity: ; Transient ; deformation ; (6924, ; 7230, ; 7240) ; 1242 ; Seismic ; cycle ; related ; deformations ; (6924, ; 7209, ; 7223, ; 7230) ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242) ; 8123 ; Tectonophysics: ; Dynamics: ; seismotectonics ; 8164 ; Stresses: ; crust ; and ; lithosphere
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    Seismicity on a fault controlled by rate- and state-dependent friction with spatial variations of the critical slip distance (2006)
    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 111, no. B1, pp. 193-206, pp. B01403, (ISSN 0343-5164)
    Details
    Publication Date: 2006
    Keywords: Seismicity ; Friction ; Rock mechanics ; Modelling ; JGR ; rate ; and ; state ; friction ; critical ; slip ; distance ; distribution ; seismicity ; evolution ; 4430 ; Nonlinear ; Geophysics: ; Complex ; systems ; 7290 ; Seismology: ; Computational ; seismology ; 8034 ; Structural ; Geology: ; Rheology ; and ; friction ; of ; fault ; zones ; (8163) ; 8118 ; Tectonophysics: ; Dynamics ; and ; mechanics ; of ; faulting ; (8004)
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    Aftershock decay, productivity, and stress rates in Hawaii: Indicators of temperature and stress from magma sources (2006)
    In:  J. Geophys. Res., Jena, Physica-Verlag, vol. 111, no. B7, pp. 1-26, pp. B07307, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Seismicity ; Aftershocks ; Omori ; Volcanology ; Gutenberg-Richter magnitude frequency b-value ; JGR ; 8499 ; Volcanology: ; General ; or ; miscellaneous ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; 7280: ; Volcano ; seismology
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    Paleoseismic evidence of great surface rupture earthquakes along the Indian Himalaya (2006)
    In:  J. Geophys. Res., Basel, Elsevier Science Publishers, vol. 111, no. B3, pp. 2328-2331, pp. B03304, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: paleo ; Seismicity ; Earthquake ; India ; Source parameters ; JGR ; Himalayan ; Frontal ; Thrust ; Siwaliks ; paleoearthquake ; slip ; rate ; Holocene ; 7209 ; Seismology: ; Earthquake ; dynamics ; (1242) ; 7221 ; Paleoseismology ; (8036) ; 8102 ; Tectonophysics: ; Continental ; contractional ; orogenic ; belts ; and ; inversion ; tectonics ; 9320 ; Geographic ; Location: ; Asia ; 9604 ; Information ; Related ; to ; Geologic ; Time: ; Cenozoic
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    An observational test of the stress accumulation model based on seismicity preceding the 1992 Landers, CA earthquake (2006)
    In:  Tectonophysics, Luxembourg, Conseil de l'Europe, vol. 413, no. 1-2, pp. 39-52, pp. B02405, (ISSN: 1340-4202)
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    Publication Date: 2006
    Keywords: Stress ; Coulomb ; AMR ; Seismicity ; Accelerating ; moment ; release ; Seismicity ; rates ; Landers ; Stress ; accumulation
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    Historical seismicity of Korea (2006)
    In:  Bulletin of the Seismological Society of America, Tulsa, 450 pp.; 2nd modified and expanded ed., Society of Exploration Geophysics, vol. 96, no. 3, pp. 846-855, pp. B02405, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Seismicity ; Earthquake catalog ; BSSA
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    Seismic activity changes progressing simultaneously with slow-slip in the Tokai area (2006)
    In:  Tectonophysics, Bonn, 3-4, vol. 417, no. 1-2, pp. 5-15, pp. B01401, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: Seismicity ; RED ; SILENT ; Earthquake ; Gutenberg-Richter magnitude frequency b-value ; Japan ; Seismic ; quiescence ; Slow-slip ; Asperity ; b-value ; change
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