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  • Geodäsie
  • earthquake
  • 2020-2022  (10)
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  • 1
    Publication Date: 2021-09-03
    Description: research
    Keywords: 551.22 ; seismogram ; earthquake ; FID-GEO-DE-7
    Language: German , English
    Type: presentation
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  • 2
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    In:  http://aquaticcommons.org/id/eprint/5771 | 704 | 2011-09-29 14:34:32 | 5771 | Fundacion Charles Darwin Foundation
    Publication Date: 2021-07-12
    Keywords: Earth Sciences ; Fernandina Volcano ; Isla Fernandina ; Galápagos ; volcanic eruption ; earthquake
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 23-26
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  • 3
    Publication Date: 2021-05-12
    Description: The earthquake environmental effects (EEEs) around the epicentral area of the Pohang earthquake (Mw-5.4) that occurred on 15 November 2017 have been collected and classified using the Environmental Seismic Intensity Scale (ESI-07 scale) proposed by the International Union for Quaternary Research (INQUA) focus group. The shallow-focus 15 November Pohang earthquake did not produce any surface rupture, but caused extensive secondary environmental effects and damage to life-line structures. This earthquake was one of the most damaging earthquakes during the instrumental seismic era of the Korean Peninsula. The EEEs included extensive liquefaction, ground cracks, ground settlement, localized rockfall, and variation of the water table. The main objective of this paper was to carry forward a comparative assessment of the Pohang earthquake’s intensity based on traditional macroseismic scales and the ESI-07 scale. With that objective, this study will also make a substantial contribution to any future revision of the ESI-07 scale, which mostly comprises case studies from Europe and South America. The comparison of the ESI-07 scale with traditional intensity scales similar to the intensity scale used by the Korean Meteorological Administration for the epicentral areas showed 1–2-degree differences in intensity. Moreover, the ESI scale provided a clearer picture of the intensity around the epicentral area, which is mostly agricultural land with a lack of urban units or buildings. This study urges the integration of the traditional and ESI-07 scale for such small magnitude earthquakes in the Korean Peninsula as well as around the world in future. This will predict seismic intensity more precisely and hence provide a more-effective seismic hazard estimation, particularly in areas of low seismic activity. The present study will also provide a useful and reliable tool for the seismic hazard assessment of similar earthquakes around the study area and land-use planning at a local scale considering the secondary effects.
    Description: Published
    Description: 471
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: JCR Journal
    Keywords: earthquake ; earthquake environmental effects ; ESI-07 ; seismic intensity ; seismic hazard assessment ; Korean Peninsula
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Publication Date: 2021-04-13
    Description: Recently, a new strain rate map of Italy and the surrounding areas has been obtained by processing data acquired by the persistent scatterers (PS) of the synthetic aperture radar interferome- try (InSAR) satellites—ERS and ENVISAT—between 1990 and 2012. This map clearly shows that there is a link between the strain rate and all the shallow earthquakes (less than 15 km deep) that occurred from 1990 to today, with their epicenters being placed only in high strain rate areas (e.g., Emilia plain, NW Tuscany, Central Apennines). However, the map also presents various regions with high strain rates but in which no damaging earthquakes have occurred since 1990. One of these regions is the Apennine sector, formed by Sannio and Irpinia. This area represents one of the most important seismic districts with a well-known and recorded seismicity from Roman times up to the present day. In our study, we merged historical records with new satellite techniques that allow for the precise determination of ground movements, and then derived physical dimensions, such as strain rate. In this way, we verified that in Irpinia, the occurrence of new strong shocks—forty years after one of the strongest known seismic events in the district that occurred on the 23 November 1980, measuring Mw 6.8—is still a realistic possibility. The reason for this is that, from 1990, only areas characterized by high strain rates have hosted significant earthquakes. This picture has been also confirmed by analyzing the historical catalog of events with seismic completeness for magnitude M ≥ 6 over the last four centuries. It is easy to see that strong seismic events with magnitude M ≥ 6 generally occurred at a relatively short time distance between one another, with a period of 200 years without strong earthquakes between the years 1732 and 1930. This aspect must be considered as very important from various points of view, particularly for civil protection plans, as well as civil engineering and urban planning development.
    Description: Published
    Description: 168
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Irpinia ; seismic hazard ; strain rate ; GNSS ; InSAR ; earthquake ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
    Publication Date: 2021-01-29
    Description: eriods of accelerated seismicity have been observed during the preparation process of many large earthquakes. This accelerating seismicity can be detected by the Accelerated Moment Release (AMR) method and its recent Revised version (RAMR) when the two techniques are applied to earthquake catalogues. The main aim of this study is to investigate the seismicity preceding large mainshocks and possibly increase our comprehension of the underlying physics. In particular, we applied both the AMR and R-AMR to the seismicity preceding 14 large worldwide shallow earthquakes, i.e. with focal depth less than 40 km, with magnitude M[6 for Mediterranean area, and M C 6.4 in the rest of the world, occurred from 2014 to 2018. Twelve case studies were analysed in the framework of SwArm For Earthquake study project funded by ESA, comprising the period 2014–2016; two additional cases were also considered to confirm the goodness of the methodology outside the period of the project catalogues. In total, R-AMR shows better performances than AMR, in 11 cases out of 14. In particular, in four out of 14 cases (i.e. 28.6%), the R-AMR method shows that acceleration exists due to an evident clustering in time–space on the faults, thus guiding the convergence of the fit; in seven cases (i.e. 50%) the R-AMR discloses acceleration, although no clustering around the fault is present; the remaining three cases (i.e. 21.4%) show no emerging acceleration from background. Finally, when R-AMR is compared with simulations, we verify that in most of the cases the acceleration is real and not casual.
    Description: Published
    Description: 4057–4087
    Description: 7T. Variazioni delle caratteristiche crostali e precursori sismici
    Description: JCR Journal
    Keywords: earthquake ; precursory acceleration ; accelerated moment release ; time to failure ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
    Publication Date: 2021-01-27
    Description: The 2019 M7.1 Ridgecrest earthquake was the strongest one in the last 20 years in California (United States). In a multiparametric fashion, we collected data from the lithosphere (seismicity), atmosphere (temperature, water vapor, aerosol, and methane), and ionosphere (ionospheric parameters from ionosonde, electron density, and magnetic field data from satellites). We analyzed the data in order to identify possible anomalies that cannot be explained by the typical physics of each domain of study and can be likely attributed to the lithosphere-atmosphere-ionosphere coupling (LAIC), due to the preparation phase of the Ridgecrest earthquake. The results are encouraging showing a chain of processes that connect the different geolayers before the earthquake, with the cumulative number of foreshocks and of all other (atmospheric and ionospheric) anomalies both accelerating in the same way as the mainshock is approaching.
    Description: Published
    Description: 540398
    Description: 7T. Variazioni delle caratteristiche crostali e precursori sismici
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: 2A. Fisica dell'alta atmosfera
    Description: JCR Journal
    Keywords: earthquake ; lithosphere-atmosphere-ionosphere coupling ; multiparametric approach ; earthquake precursor anomalies ; earthquake preparation process
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
    Publication Date: 2020-03-04
    Description: Italy is a seismic country being in the merging zone of African and Euro-Asiatic plates and several destructive earthquakes occurred in the last few decades. For this reason, it is important to educate children about seismic risk and make them aware of simple behaviors and expedients that can save their life. But, how can we explain seismic risks or what an earthquake is to pre-scholar children? It is not simple because, at this age, children do not know what the word “risk” means and entails. A method to explain earthquakes has been developed and tested in a school with the collaboration of teachers willing to educate their young students to deal with natural risks and teach how properly behave. The method consists in a story telling using a “butai-kamishibai” (Japanese imagine theatre) with manually sliding paper imagines. This old technique, used by wandering storyteller, is very incisive because the butai-kamishibai produces by itself a scenography that creates a strong involvement between the teller and the listeners. The story is about a young girl (named Giuseppa) traveling inside the Earth where she meets a dragon whose jumps cause earthquakes. Inside the story, there is a nursery rhyme explaining what to do when the dragon jumps and the school shakes (for instance, go under the desk, be far from windows, keep calm, line up in pairs and so on). The story telling has just the purpose to catch children attention while the nursery rhyme helps to teach, entertaining, the right behaviors to adopt during an earthquake. After a break during which children can create/color their own dragon, there is a game having the aim to draw up the life-saving actions. The game is developed by means of a magnetic blackboard divided in two parts (true and false), magnets of the story characters acting (in the right or wrong way) during an earthquake. One by one, children pick a magnet from a bag and put it on the right/wrong side of the blackboard explaining why. After the first test, this method has been carried out in several nursery schools always obtaining a positive outcome. Teachers love Giuseppa story because activities are proposed in a playful but, at the same time, seriously way especially when life-saving actions are showed communicating the importance of what children are learning.
    Description: Unpublished
    Description: San Francisco - California - USA
    Description: 2TM. Divulgazione Scientifica
    Keywords: earthquake ; storytelling
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 8
    Publication Date: 2020-02-27
    Description: The current development of high performance parallel supercomputing infrastructures are pushing the boundaries of applications of science and are bringing new paradigms into engineering practices and simulations. Earthquake engineering is also one of the major fields, which benefits from above by looking for solutions in grid computing and cloud computing techniques. Generally, earthquake simulations involve analysis of petabytes of data. Analyzing these large amounts of data in parallel in thousands of nodes in computer clusters results in gaining high performances. Open source cloud solutions such as Hadoop MapReduce, which is highly scalable and capable of processing large amount of data rapidly in parallel on large clusters provide better solution compared to RDBDM. Both GPUs and MapReduce are designed to support vast data parallelism. For performance considerations, GPU computing could be adopted over low performing CPU systems. This paper discusses MapReduce system using Hadoop and Mars. Mars is a MapReduce framework on graphics processor. Hence, the proposition is to use GPU based systems for earthquake simulations in which Digital elevation model 3D data sets are fully materialized where scientist can make use of these data for various analysis and simulations.
    Description: Published
    Description: Peradeniya, Sri Lanka
    Description: 3IT. Calcolo scientifico
    Keywords: Map reduce ; earthquake
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 9
    Publication Date: 2020-02-11
    Description: This research was inspired by an old stereoscopic viewer from the early 1900s, containing 42 glass slides depicting scenes from two ancient and almost forgotten Italian earthquakes. We refer to the earthquakes that struck Southern Calabria and Eastern Sicily in the years 1894 and 1905, causing extensive destruction and hundreds of deaths, but whose memory was blurred by the subsequent, great earthquake of the Sicilian Strait of December 28,1908 which caused about 80,000 deaths.
    Description: Unpublished
    Description: Vienna, Austria
    Description: 4T. Sismicità dell'Italia
    Keywords: earthquake ; macroseismics ; taxiphote ; Sicily ; 04.06. Seismology ; 05.03. Educational, History of Science, Public Issues ; 05.09. Miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 10
    Publication Date: 2020-02-10
    Description: Smectite clays are the main constituent of slipping zones found in subduction zone faults at shallow depth (e.g., 〈1-km depth in the Japan Trench) and in the decollements of large landslides (e.g., 1963 landslide, Vajont, Italy). Therefore, deformation processes in smectite clays may control the mechanical behavior from slow creep to fast accelerations and slip during earthquakes and landslides. Here, we use (1) laboratory experiments to investigate the mechanical behavior of partly water-saturated smectite-rich gouges sheared from subseismic to seismic slip rates V and (2) nanoscale microscopy to study the gouge fabric. At all slip rates, deformation localizes in volumes of the gouge layer that contain a "nanofoliation" consisting of anastomosing smectite crystals. "Seismic" nanofoliations produced at V = 0.01, 0.1, and 1.3 m/s are similar to "subseismic" nanofoliations obtained at V = 10-5 m/s. This similarity suggests that frictional slip along water-lubricated smectite grain boundaries and basal planes may occur from subseismic to seismic slip rates in natural smectite-rich faults. Thus, if water is available along smectite grain boundaries and basal planes, nanofoliations can develop from slow to fast slip rates. Still, when nanofoliations are found highly localized in a volume, they can be diagnostic of slip that occurred at rates equal or larger than 0.01 m/s. In such a case, they could be markers of past seismic events when found in natural fault rocks.
    Description: European Research Council Consolidator. Grant Number: 614705 NOFEAR
    Description: Published
    Description: 6589-6601
    Description: 3T. Sorgente sismica
    Description: JCR Journal
    Keywords: earthquake ; microstructure ; deformation processes ; high velocity friction
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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