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  • Articles  (10)
  • 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution  (4)
  • Magnitude of Completeness  (4)
  • 04. Solid Earth::04.03. Geodesy::04.03.05. Gravity variations
  • J24
  • Lunar and Planetary Science and Exploration
  • 2015-2019
  • 2010-2014  (10)
  • 1995-1999
  • 2010  (10)
Collection
  • Articles  (10)
Source
Keywords
Publisher
Years
  • 2015-2019
  • 2010-2014  (10)
  • 1995-1999
Year
  • 1
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    Coseismic and initial postseismic slip of the 2009 Mw 6.3 l’Aquila earthquake, Italy, from GPS measurements (2010)
    Details
    Publication Date: 2021-06-07
    Description: Here we report the preliminary results of GPS data inversions for coseismic and initial afterslip distributions of the Mw 6.3 2009 April 6 L’Aquila earthquake. Coseismic displacements of continuous and survey-style GPS sites, show that the earthquake ruptured a planar SW-dipping normal fault with ∼0.6 m average slip and an estimated moment of 3.9 × 1018 Nm. Geodetic data agree with the seismological and geological information pointing out the Paganica fault, as the causative structure of the main shock. The position of the hypocentre relative to the coseismic slip distribution supports the seismological evidence of southeastward rupture directivity. These results also point out that the main coseismic asperity probably ended downdip of the Paganica village at a depth of few kilometres in agreement with the small (1–10 cm) observed surface breaks. Time-dependent post-seismic displacements have been modelled with an exponential function. The average value of the estimated characteristic times for near-field sites in the hanging-wall of the fault is 23.9 ± 5.4 d. The comparison between coseismic slip and post-seismic displacements for the first 60 d after the main shock, shows that afterslip occurred at the edges of the main coseismic asperity with a maximum estimated slip of ∼25 cm and an equivalent seismic moment of 6.5 × 1017 Nm. The activation of the Paganica fault, spatially intermediate between the previously recognized main active fault systems, suggests that strain accumulation in the central Apennines may be simultaneously active on distinct parallel fault systems.
    Description: Published
    Description: 1539–1546
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: 1.9. Rete GPS nazionale
    Description: JCR Journal
    Description: restricted
    Keywords: satellite geodesy ; earthquake source observations ; Continental tectonics: extensional ; Europe ; 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::04.06.01. Earthquake faults: properties and evolution ; 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
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Clues of Post-seismic Relaxation for the 1915 Fucino Earthquake (Central Italy) from Modeling of Leveling Data (2010)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: The 1915 Fucino earthquake (Ms=6.9) was one of the largest and most destructive events in Italy during the last century. The epicentral area is centered in the Abruzzi region (Central Italy), where a long historical record of large earthquakes is available. Seismotectonic studies on this region, based on instrumental seismicity (focal mechanism solutions of major events and stress analysis of background seismicity), borehole break-out studies and several geological and paleoseismological investigations, suggest NE-SW oriented active extension. The 1915 earthquake fault produced detectable surface ruptures for about 20 km along NW-SE striking SW-dipping structures. Coseismic geodetic data recorded in the epicentral area have been inverted in the past (Amoruso et al. 1998 and references therein), indicating a source fault dipping at moderate angle toward SW and a normal focal mechanism, with a non-negligible left-lateral component. Three high precision leveling lines located in a wide sector north and east of the Fucino plain were measured in 1950 and 1997-2000 by the IGM (Istituto Geografico Militare). Two consecutive lines run in a NW-SE direction along the chain, and form a "T-shape" net together with a third line SW-NE striking, towards the Adriatic sea. The total length is about 360 km with a mean benchmark density higher than 0.5 bm/km. The relative elevation changes recorded during this time interval show maximum values between 7 and 12 cm with a signal wavelength of 40-70 km. The observed elevation changes stand significantly above the calculated total error of 1.13 mm sqrt(L) km. A sharp gradient has been observed east of the earthquake epicenter, where we observe peculiar elevation changes along a 40 km long section of the leveling line. The observed elevation changes in Fucino earthquake area seem to comprise both regional tectonic deformation and post-seismic relaxation. The former and the latter effects are expected to dominate along sections of the leveling lines which are respectively about perpendicular and parallel to the Apennines. Since we compare measurements performed in 1950 and 1997-2000, relaxation effects refer to a late stage of the process. We have used Pollitz (1997) code for computing gravitational-viscoelastic postseismic relaxation on a layered spherical Earth. Different Earth models, characterized by different thicknesses and viscosities of crustal layers and of the upper mantle, have been considered. Even if S/N ratio of expected post-seismic effects is not high, comparison between predictions and observations allows to constrain regional crustal structure. Best-fit seismic moment is in good agreement with Amoruso et al. (1998) and residuals are fully consistent with expected regional tectonic deformation in central Apennines.
    Description: Published
    Description: San Francisco, USA
    Description: open
    Keywords: postseismic ; 1915 Fucino earthquake ; levelling ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 04. Solid Earth::04.06. Seismology::04.06.05. Historical seismology ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 3
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    Messina 1908-2008: understanding crust dynamics and subduction in Southern Italy (2010)
    Details
    Publication Date: 2017-04-04
    Description: To mark the centennial anniversary of the 1908 earthquake that shook Messina, Italy, the Istituto Nazionale di Geofisica e Vulcanologia (INGV) has begun the "Messina 1908- 2008" research project. The aim is to clarify the extension deformation processes that occur in the Messina Strait and to understand relationships between subduction and crustal deformation there by merging existing data and studies, and by collecting new and more detailed seismological, geodetic, historical, and satellite observations. More than 20 permanent seismic stations and about 15 temporary stations are located in the study region. A dense permanent geodetic network also operates in the region, several campaign surveys are newly available, and new geodetic campaign measurements were performed in March 2008. In addition, during July 2008, five ocean bottom seismometers (OBS) were deployed to better monitor the area largely covered by the sea. Records of historical earthquakes that struck the Strait of Messina will be analyzed, and synthetic aperture radar images will help define surface deformation of the region. The Messina 1908-2008 project's assemblage of a database and integration of innovative technologies could transform our understanding of the crust and mantle structure of the active tectonics and seismic hazards of the Strait of Messina.
    Description: Unpublished
    Description: San Francisco, CA (USA)
    Description: 3.1. Fisica dei terremoti
    Description: 3.2. Tettonica attiva
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: open
    Keywords: Messina ; Instruments and techniques ; Seismic instruments and networks ; Subduction zone processes ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 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
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 4
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    RENDICONTO SULL’ATTIVITA’ DI SORVEGLIANZA SVOLTA NEL 2008 (1 Gennaio – 31 Dicembre 2008) MISURE GRAVIMETRICHE AL VESUVIO (2010)
    Details
    Publication Date: 2017-04-04
    Description: Nel corso del 2008 sono state eseguite due campagne gravimetriche nell’area vesuviana; la prima nel mese di aprile, la seconda a cavallo dei mesi di novembre e dicembre. In entrambe le campagne, i dati sono stati rilevati su 31 dei 32 vertici costituenti la rete in quanto la stazione “Baracche Forestali”, ubicata lungo la linea che corre all’interno della Forestale, è andata distrutta nel 2007 a causa di lavori di ripristino nell’area.
    Description: Istituto Nazionale di Geofisica e Vulcanologia
    Description: Published
    Description: 2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attive
    Description: open
    Keywords: MISURE GRAVIMETRICHE ; VESUVIO ; 04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods ; 04. Solid Earth::04.03. Geodesy::04.03.05. Gravity variations ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 5
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    RENDICONTO SULL’ATTIVITA’ DI SORVEGLIANZA SVOLTA NEL 2008 (1 Gennaio – 31 Dicembre 2008)MISURE GRAVIMETRICHE AI CAMPI FLEGREI (2010)
    Details
    Publication Date: 2017-04-04
    Description: Nel 2008 sono state effettuate due campagne gravimetriche ai Campi Flegrei; la prima nel mese di febbraio, la seconda dal 20 ottobre al 11 novembre. In entrambre le campagne le misure sono state rilevate sull’intera rete che, nel corso della secondo rilevamento, è stata amplianta con l’istituzione di due nuovi vertici posizionati lungo la linea costiera, e precisamente tra le stazioni di Bagnoli e La Pietra.
    Description: Istituto Nazionale di Geofisica e Vulcanologia
    Description: Published
    Description: 2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attive
    Description: open
    Keywords: MISURE GRAVIMETRICHE ; CAMPI FLEGREI ; 04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods ; 04. Solid Earth::04.03. Geodesy::04.03.05. Gravity variations ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 6
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    La rete sismica del Montana (U.S.A.): performance di localizzazione e magnitudo di completezza (2010)
    Details
    Publication Date: 2020-02-24
    Description: In questo lavoro abbiamo applicato il metodo SNES (D’Alessandro et. al.) alla rete sismica nazionale del Montana che monitorizza la sismicità nell’area settentrionale delle “Rocky Mountains”. Questa rete sismica è costituita da 38 stazione che coprono un’area di circa 50,000 km2 nel Montana occidentale. Il Montana occidentale include la parte settentrionale dell’Intermountain Seismic Belt (Smith and Arabasz, 1991), una zona con sismicità poco profonda con faglie del tardo Quaternario che si estendono per 450 km dal parco Nazionale di Yellostone sino ai confini canadesi. Una cintura sismica collegata, la Centennial Tectonic Belt (Stickney and Bartholomew, 1987), si estende verso ovest lungo il margine settentrionale dello Snake River Plain attraverso il Montana sud-occidentale sino allo stato dell’Idaho. Storicamente, queste zone, sismicamente molto attive, hanno prodotto 28 terremoti con magnitudo tra 5.0 to 7.3. Il più forti di questi (Clarkston 1925, M 6.6; Helena 1935, M 6.3 and 6.0; and Hebgen Lake 1959; M 7.3) hanno causato 33 decessi e oltre 52 milioni di dollari di danno. Le mappe SNES sono state costruite per magnitudo locale di 1.4, 1.6, 1.8, 2.0, e 2.2 fissando la profondità ipocentrale a 10 km e il livello di confidenza al 95%. Attraverso l’applicazione del metodo SNES è stato mostrato che la rete sismica nazionale del Montana fornisce la migliore copertura nella “Flathead Valley”, con errori che per magnitudo 2 sono inferiori a 2 e 6 km per l’epicentro e per la profondità ipocentrale rispettivamente. A magnitudo 2.2, questa rete sismica è capace di localizzare terremoti con profondità ipocentrale di 150 km e fornisce una magnitudo di completezza inferiore a 1.5 per la maggior parte del Montana occidentale. Sono state inoltre delineate alcune aree sismogenetiche, inclusa la porzione centrale del “Centennial Tectonic Belt” nella parte più a sud-ovest del Montana, che non risultano adeguatamente coperte dalla rete.
    Description: Published
    Description: Prato (Italy)
    Description: open
    Keywords: SNES ; Montana Seismic Network ; Magnitude of Completeness ; location performance ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 7
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    Location perf ormance of the Greek National Seismic Network: an evaluation by the SNES method (2010)
    Details
    Publication Date: 2020-02-24
    Description: Seismic networks are powerful tools for understanding the state of seismo-tectonic processes taking place in a region. Their numerous applications, from monitoring seismicity to characterizing seismogenic volumes, make seismic networks essential tools for the seismic risk assessment. Appropriately structured seismic network may also be a valuable tool for the study of deep geological structures through seismic tomography. The ability to detect small and medium sized events requires a seismic network with sufficient number of low noise stations that are optimally distributed. It is, therefore, important to assess existing capabilities of a seismic network, to identify seismic areas that are not adequately covered, and to further ascertain measures for the network improvement. Greece, is the most seismically active region in the whole Mediterranean and in the whole West Eurasia. Seismicity is associated with the collision between the Eurasian and the African lithospheric plates. Regional seismicity in Greece is monitored by the Greek National Seismic Network that composed by about 120 seismic stations. In this poster we will evaluate earthquake location performance of the Greece National Seismic Network though SNES (Seismic Networks Evaluation through Simulation) method. The SNES method gives, as function of magnitude, hypocentral depth and confidence level, the spatial distribution of: number of active stations in the earthquake location, azimuthal gaps and confidence intervals in hypocentral parameters regarding both the geometry and noisiness of the seismic network and the use of an inadequate velocity model. In particular, through SNES we have identified high and low seismic noise areas of Greece National Seismic Network. Through statistical analysis of P and S residual times we have assessed validity of velocity models used in earthquake location routines and estimate an empirical law that link travel time residual time variance to the hypocentral distance. Finally, from analysis of produced SNES maps, we will identify regions in Greece where it may be opportune to improve the existing seismic network.
    Description: Published
    Description: Montpellier (France)
    Description: open
    Keywords: Greek National Seismic Network ; SNES ; Magnitude of Completeness ; Location Performance ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 8
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    Montana Regional Seismic Network Perf ormance: an evaluation through SNES method (2010)
    Details
    Publication Date: 2020-02-24
    Description: A properly organized seismic network is a valuable tool for monitoring seismic zones and evaluating seismic hazard. In this paper we analyze the location performance of the Montana Regional Seismic Network by SNES method (Seismic Network Evaluation through Simulation, D’Alessandro et al., 2010). This method permits us to construct, as a function of magnitude, hypocentral depth and confidence level, maps of the number of active stations in the location procedure and the relative azimuthal gaps and confidence intervals in hypocentral parameters regarding both the geometry of the seismic network and the use of an inadequate velocity model. The Montana Regional Seismograph Network is comprised of 38 stations deployed over an area of approximately 50,000 km2. Montana and immediately surrounding regions have a high level of seismicity that includes approximately 1500 locatable earthquakes annually, most of which occur along the Intermountain Seismic Belt and Centennial Tectonic Belt in the northern Rocky Mountains. Through application of the SNES method, we show that the M ontana Regional Seismic Network provides the best monitoring coverage in the Flathead Valley of northwestern M ontana and it provides a threshold of completeness down to magnitude 1.8 for most of western Montana. We delineate some seismogenic areas of western Montana, including the central portion of the Centennial Tectonic Belt in extreme southwestern Montana, that are not adequately covered by the existing network. The SNES technique provides guidance for optimal upgrades to the network to provide adequate monitoring coverage for the seismogenic parts of the Northern Rocky M ountains.
    Description: Published
    Description: Montpellier (France)
    Description: open
    Keywords: Montana Regional Seismic Network ; Location Performance ; SNES ; Magnitude of Completeness ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 9
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    Location performance of the Alaska regional seismic network: an evaluation by the SNES method (2010)
    Details
    Publication Date: 2017-04-04
    Description: Seismic networks are powerful tools for understanding the state of seismo-tectonic processes taking place in a region. Their numerous applications, from monitoring seismicity to characterizing seismogenic volumes, make seismic networks essential tools for the seismic risk assessment. Appropriately structured seismic network may also be a valuable tool for the study of deep geological structures through seismic tomography. The ability to detect small and medium sized events requires a seismic network with sufficient number of low noise stations that are optimally distributed. It is, therefore, important to assess existing capabilities of a seismic network, to identify seismic areas that are not adequately covered, and to further ascertain measures for the network improvement. Alaska is the most seismically active region of the United States. Seismicity is associated with the subduction of the P acific plate beneath the North American plate, with the transform boundary in the southeast Alaska, and with numerous crustal faults throughout the State. Regional seismicity in Alaska is monitored by the Alaska Earthquake Information Center (AEIC) utilizing combined regional seismic network that comprises over 400 seismic sites. In this poster we will evaluate earthquake location performance of the Alaska regional seismic network though SNES (Seismic Networks Evaluation through Simulation) method. This method analyzes noise levels of existing stations, location errors, and velocity uncertainties and produces certain metrics that allow to asses capabilities of an existing network. In particular, through SNES we have identified high and low seismic noise areas of Alaska seismic network. Through statistical analysis of P and S residual times we have assessed validity of velocity models used by AEIC in their earthquake location routines and produced empirical formulas that link travel time residual time variance to the hypocentral distance. Finally, from analysis of produced SNES maps, we will identify regions in Alaska where it may be opportune to improve the existing seismic network.
    Description: Published
    Description: Montpellier (France)
    Description: open
    Keywords: Alaska Regional Seismic Network ; SNES ; Magnitude of Completeness ; Location Performance ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 10
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    Deliverable # 3.01.2 Slip rate data of seismogenic sources included in DISS (2010)
    Details
    Publication Date: 2024-02-01
    Description: This deliverable contains three different products: one table with reclassified slip rate data from DISS, one table with slip rate values calculated from numerical models, and two study cases that illustrate the applications of original methods to estimate slip rate.
    Description: Agreement INGV-DPC 2007-2009 Project S1: Analysis of the seismic potential in Italy for the evaluation of the seismic hazard
    Description: Published
    Description: 3.2. Tettonica attiva
    Description: 4.2. TTC - Modelli per la stima della pericolosità sismica a scala nazionale
    Description: open
    Keywords: DISS ; slip rate ; active fault ; seismogenic source ; 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology ; 04. Solid Earth::04.04. Geology::04.04.02. Geochronology ; 04. Solid Earth::04.04. Geology::04.04.03. Geomorphology ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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