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  • 1
    Call number: STR 11/14
    In: Scientific technical report
    Description / Table of Contents: This short report describes the first attempt at obtaining a preliminary cross-border risk model for Central Asia starting from datasets that were already available at the beginning of the EMCA Project.
    Pages: Online-Ressource
    Series Statement: Scientific technical report / Deutsches GeoForschungsZentrum GFZ 11/14
    Branch Library: GFZ Library
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  • 2
    Call number: STR 11/11
    In: Scientific technical report
    Pages: Online-Ressource
    Series Statement: Scientific technical report / Deutsches GeoForschungsZentrum GFZ 11/11
    Branch Library: GFZ Library
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  • 3
    ISSN: 1573-157X
    Keywords: earthquake location errors ; focal depth ; subcrustal seismicity ; Western Alps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract It is usually assumed that earthquakes in intraplate regions occur in the upper crust, and northwestern Italy is generally assigned to this kind of ‘normal’ seismicity. In this work, the depth distribution of the events localized in this area by the Istituto Geofisico Geodetico (IGG) seismic network in the period 1991–1997 is analyzed in detail. In particular, the location capability of the network is discussed, adopting as reference quarry blasts (for the epicentral position) and the locations obtained from a dense temporary network (for the depth estimate). Within the so-obtained error limits, the depth distribution of events show a characteristic pattern: while for most of the area covered by the network the well-located seismicity lies within the first 20 km of depth, in a band following the inner arc of the Western Alps, numerous events have anomalously large focal depths, reaching a maximum of 114 km. These depth determinations cannot be attributed to instabilities of the location procedure: different choices of the propagation models used for the hypocentral determination led to very similar depth values, always significantly larger than the standard values for the surrounding areas. A strong correlation has been found between the 3-dimensional distribution of these foci and the P-wave propagation anomalies obtained from tomographic studies, suggesting a direct link between elastic and rheological properties of lower crust and upper mantle in this area.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2016-11-25
    Description: Abstract
    Description: This data publication includes the DESERVE Earthquake Catalogue of historical and recent earthquakes and the DESERVE Macroseismic Intensity Dataset. The DESERVE Earthquake Catalogue is a catalog of historical earthquakes in the region around the Dead Sea. It was compiled from several sources, including recent events (〉 Mw 3) for the region between 24.55° and 37.80° N and between 29.95° and 40.80° E. The catalogue includes events that occurred between the year 23 C.E. and 2014 C.E. and their magnitude was harmonized to moment magnitude. Details on how duplicates were removed, which magnitude conversions were applied, about the original data sources and the catalog completeness can be found in Haas et al. (2016). The DESERVE Macroseismic Intensity Data set consists of macroseismic intensity observations for historical earthquakes in the region around the Dead Sea. It was compiled from several sources, including seismic events (Mw 4.2 - 7.9) that occurred between the year 23 C.E. and 1995 C.E for the region between 23.78° and 41.01° N and between 24.81° and 50.16°. Details on the the original sources can be found in Haas et al. (2016). Both datasets are available in csv format and accompanied by explanatory files.
    Description: Other
    Description: The Virtual Institute DEad SEa Research Venue DESERVE is a cross-disciplinary and cooperative international project of the Helmholtz Centers KIT, GFZ, and UFZ with well-established partners in the Dead Sea region. The region faces big natural challenges. Among them are sea level decline, desertification, flash floods, ascending brines polluting freshwater, sinkhole development, and the repeated occurrence of earthquakes. Climate change and extensive exploitation of groundwater and surface water even aggravate the situation. These challenges can be only mastered in an interdisciplinary research effort involving all neighbouring countries. DESERVE is offering the unique opportunity to integrate the scientific results already achieved or presently elaborated in the Dead Sea region into a joint scientific approach based on earth, water, and environmental sciences. DESERVE is aimed at studying coupled atmospheric, hydrological, and lithospheric processes, such as sinkholes, flash floods, and earthquakes. This interdisciplinary research approach will contribute to a sound scientific understanding of the ongoing processes. Furthermore, it enables the development of prediction models, remediation strategies, and risk assessments with respect to environmental risk, water availability, and climate change. DESERVE is funded by the Helmholtz Association of German Research Centers.
    Keywords: historical seismicity ; seismic catalogue ; Dead Sea ; Middle East ; macroseismic intensity ; DESERVE
    Language: English
    Type: Dataset
    Format: 1358642 Bytes
    Format: 3 Files
    Format: application/pdf
    Format: application/vnd.ms-excel
    Format: application/vnd.ms-excel
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  • 5
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    GFZ Data Services
    Publication Date: 2017-04-10
    Description: Abstract
    Description: A temporary local seismic network was installed in the basin of Norcia (Italy) in January 2009 and operated until May 2009. Several recordings collected by the network are earthquakes of the 2009, Mw 6.3 L'Aquila seismic sequence. The seismic equipments consisted of fifteen Earth-Data Loggers (24 bit) connected to Mark L4-3D sensors (1Hz). The stations continuously recorded at a rate of 100 samples per second, and the timing was provided by a GPS link. Waveform data are available from the GEOFON data centre.
    Keywords: Seismic waveforms
    Type: Other , Seismic Network
    Format: Approximately 80 GB
    Format: SEED data
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  • 6
    Publication Date: 2019-09-26
    Description: Abstract
    Description: Version History11 Sep 2019: Release of Version 1.1 with the following changes: (1) new licence: CC BY SA 4.0, modification of the title: removal of file name and version); (2) addition of ORIDs when available; (3) actualisation of affiliations for some authors The metadata of the first version 1.0 is available in the download folder.. Data and file names remain unchanged.Area Source model for Central AsiaThe area sources for Central Asia within the EMCA model are defined by mainly considering the pattern of crustal seismicity down to 50 km depth. Although tectonic and geological information, such as the position and strike distribution of known faults, have also been taken into account when available. Large area sources (see, for example source_id 1, 2, 5, 45 and 52, source ids are identified by parameter “source_id” in the related shapefile) are defined where the seismicity is scarce and there are no tectonic or geological features that would justify a further subdivision. Smaller area sources (e.g., source_id values 36 and 53) have been designed where the seismicity can be assigned to known fault zones.In order to obtain a robust estimation of the necessary parameters for PSHA derived by the statistical analysis of the seismicity, due to the scarcity of data in some of the areas covered by the model, super zones are introduced. These super zones are defined by combining area sources based on similarities in their tectonic regime, and taking into account local expert’s judgments. The super zones are used to estimate: (1) the completeness time of the earthquake catalogue, (2) the depth distribution of seismicity, (3) the tectonic regime through focal mechanisms analysis, (4) the maximum magnitude and (5) the b values via the GR relationship.The earthquake catalogue for focal mechanism is extracted from the Harvard Global Centroid Moment Tensor Catalog (Ekström and Nettles, 2013). For the focal mechanism classification, the Boore et al. (1997) convention is used. This means that an event is considered to be strike-slip if the absolute value of the rake angle is 〈=30 or 〉=150 degrees, normal if the rake angle is 〈-30 or 〉-150 and reverse (thrust) if the rake angle is 〉30 or 〈150 degrees. The distribution of source mechanisms and their weights are estimated for the super zones.For area sources, the maximum magnitude is usually taken from the historical seismicity, but due to some uncertainties in the magnitudes of the largest events, the opinions of the local experts are also included in assigning the maximum magnitude to each super zone. Super zones 2 and 3, which belongs to stable regions, are each assigned a maximum magnitude of 6, after Mooney et al. (2012), which concludes after analyses and observation of modern datasets that at least an event of magnitude 6 can occur anywhere in the world. For hazard calculations, each area source is assigned the maximum magnitude of their respective super zone.For processing the GR parameters (a and b values) for the area sources, the completeness analysis results estimated for the super zones are assigned to the respective smaller area sources. If the individual area source has at least 20 events, the GR parameters are then estimated for the area source. Otherwise, the b value is adopted from the respective super zone to which the smaller area source belongs, and the a value is estimated based on the Weichert (1980) method. This ensures the stability in the b value as well as the variation of activity rate for different sources.The hypocentral depth distribution is estimated from the seismicity inside each super zone. The depth distribution is considered for maximum up to three values. Based on the number of events, the weights are assigned to each distribution. These depth distributions, along with corresponding weights, are further assigned to the area sources within the same super zones.
    Description: Other
    Description: Distribution file: "EMCA_seismozonesv1.0_shp.zip"Version: v1.0Release date: 2015-07-30Format: ESRI ShapefileGeometry type: polygonsNumber of features: 63Spatial Reference System: +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defsDistribution file: "EMCA_seismozonesv1.0_nrml.zip"Version: v1.0Release date: 2015-07-30Format: NRML (XML) Format compatible with the GEM OpenQuake platform (http://www.globalquakemodel.org/openquake/about/platform/)Feature attributes:src_id : Id of the seismic sourcesrc_name : Name of the seismic sourcetect_reg: Tectonic regime of the seismic sourceupp_seismo : Upper level of the the seismogenic depth (km)low_seismo : Lower level of the seismogenic depth (km)mag_scal_r: Magnitude scaling relationshiprup_asp_ra: Rupture aspect ratiomfd_type : Magnitude frequency distribution typemin_mag: Minimum magnitude of the magnitude frequency relationshipmax_mag: Maximum magnitude of the magnitude frequency relationshipa_value: a value of the magnitude frequency relationshipb_balue : b value of the magnitude frequency relationshipnum_npd: number of nodal plane distributionweight_1 : weight of 1st nodal plane distributionstrike_1: Strike of the seismic source (degrees)rake_1: rake of the seismic source (degrees)dip_1: dip of the seismic source (degrees)num_hdd: number of hypocentral depth distributionhdd_d_1: Depth of 1st hypocentral depth distribution (km)hdd_w_1: Weight of 1st hypocentral depth distribution
    Keywords: seismogenic sources ; central asia ; EMCA ; GEM ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES 〉 EARTHQUAKE OCCURRENCES ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES 〉 EARTHQUAKE MAGNITUDE/INTENSITY ; EARTH SCIENCE SERVICES 〉 DATA MANAGEMENT/DATA HANDLING 〉 CATALOGING
    Type: Dataset
    Format: 1 Files
    Format: application/octet-stream
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  • 7
    Publication Date: 2004-02-01
    Description: The application of the horizontal-to-vertical (H/V) spectral ratio technique to earthquake recordings can lead to significant differences in the estimate of the site response compared to that produced by the reference-site method (RSM). In particular, whereas the estimates of the resonance frequency from the two methods are fairly consistent, the levels of amplification are not. Using numerical modeling based on an improved Thompson-Haskell propagator matrix method, we were able to isolate the contribution of pure and converted waves to the site response. We show that the conversion of body waves at the sediment-bedrock interface leads to differences in the site response estimates obtained by the H/V method and the RSM. Such differences are consistent with observations in the field. In particular, the lower level of amplification obtained by the H/V method at frequencies higher than the fundamental one is due to a transfer of energy onto the vertical component caused by S- to P-wave conversion. Applying the RSM technique to the vertical as well as the horizontal component of the P-wave window, we obtain stable estimates of the fundamental resonance frequency that are consistent with 1D resonance for vertically incident P and S waves, respectively. The amplification from the P-wave window of the horizontal component might be considered as a lower boundary.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
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  • 8
    Publication Date: 2004-02-01
    Description: In this article, we investigate, by means of simulations, the reliability of the attenuation parameter k when it is evaluated in the presence of site amplification effects. We consider a single soil layer overlying the bedrock, and we assume that k describes the attenuation due to propagation through the soil layer. We generate synthetic spectra for events with magnitudes from 2 to 6, taking into account different soil-layer properties. In particular, we consider 1D site transfer functions that account for fundamental resonance frequencies varying from 1 to 12 Hz and S-wave velocities ranging from 360 to 1000 m/sec. A least-squares fit to determine the slope of the high-frequency decay is performed over spectral windows having different widths. The results show that site resonance at both intermediate (4 Hz〈 or =f (sub 0) 〈9 Hz) and high (f (sub 0) 〉 or =9 Hz) frequencies leads to unreliable k estimates due to the spectral windows selected to perform the least-squares fit not being wide enough to average out local peaks resulting from site amplification effects. This is an important result because, in the analysis of weak motion data, the exploitable frequency band is usually no wider than those adopted in this work. The results relevant to the simulations that consider high fundamental resonance frequencies, close to or inside the spectral windows adopted to perform the fit, indicate that the contribution of k to the high-frequency decay can be completely masked even if an excellent fit is obtained. In these cases, the soil properties estimated from k values may be unreliable, especially when high impedance contrasts exist. For fundamental resonance frequencies well below the frequency range selected for least-squares fitting, fairly good results can be obtained.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
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  • 9
    Publication Date: 2005-10-01
    Description: Statistical properties of the horizontal to vertical spectral ratios (HVSR) applied to noise recording are analyzed in order to define optimal strategies for numerical processing and identification of possible artifacts. To this purpose, two time series have been analyzed: one constituted by environmental seismic noise in the presence of a genuine physical signal and one relative to pure instrumental noise, both obtained with the same experimental apparatus. By means of suitable statistics, some guidelines for the HVSR analysis are provided. A statistical test proposed by Albarello (2001) for the identification of artifacts in the HVSR function has been analyzed and invalidated.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
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  • 10
    Publication Date: 2011-03-22
    Description: Structural health monitoring (SHM) aims to improve knowledge of the safety and maintainability of civil structures. The usage of recording systems exploiting wireless communication technology is particularly suitable for SHM, especially for rapid response following earthquakes. In this study, both of these issues are combined, and we report on the application of seismic interferometry to SHM using a dataset of seven earthquakes collected using a novel wireless system of accelerometers during the L'Aquila, Italy, seismic sequence in 2009. We show that interferometric analysis allows the estimation of the shear-wave velocity of seismic phases propagating throughout a structure, and, most important for SHM purposes, allows the monitoring of the velocity variations during the aftershock sequence. Moreover, innovatively we apply the S transform to the building response functions retrieved by interferometry to estimate the fundamental resonance frequency and the quality factor Q.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
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