Options
Costa, Giovanni
Loading...
6 results
Now showing 1 - 6 of 6
- PublicationOpen AccessThe Engineering Strong‐Motion Database: A Platform to Access Pan‐European Accelerometric Data(2016)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;This article describes the Engineering Strong-Motion Database (ESM), developed in the framework of the European project Network of European Research Infrastructures for Earthquake Risk Assessment and Mitigation (NERA, see Data and Resour- ces). ESM is specifically designed to provide end users only with quality-checked, uniformly processed strong-motion data and relevant parameters and has done so since 1969 in the Euro- Mediterranean region. The database was designed for a large variety of stakeholders (expert seismologists, earthquake engi- neers, students, and professionals) with a user-friendly and straightforward web interface. Users can access earthquake and station information and download waveforms of events with magnitude ≥ 4:0 (unprocessed and processed acceleration, velocity, and displacement, and acceleration and displacement response spectra at 5% damping). Specific tools are also available to users to process strong-motion data and select ground-motion suites for code- based seismic structural analyses.283 177 - PublicationOpen AccessA proposal of regionalization for the application of the CN earthquake prediction algorithm to the Italian territory(1999-10)
; ; ; ;Peresan, A.; Dipartimento di Scienze della Terra, Università di Trieste, Italy ;Costa, G.; Dipartimento di Scienze della Terra, Università di Trieste, Italy ;Panza, G. F.; Dipartimento di Scienze della Terra, Università di Trieste, Italy; ; A regionalization of the Italian territory, strictly based on seismotectonic zoning and the main geodynamic features of the Italian area, is proposed for intermediate-term earthquake prediction with CN algorithm. Three regions, composed of adjacent zones with the same seismogenic behaviour or with transitional properties, are selected for the north, centre and south of Italy, compatibly with the kinematic model. This regionalization allows us an average reduction of the spatial uncertainty of about 35% for the northern and central regions, and of about 70% for the southern region in comparison with previous studies. A general reduction of the percentage of total TIPs, with respect to the results obtained neglecting the seismotectonic zoning, has been observed as well. Therefore, it seems that the seismotectonic model is a useful tool selection of the fault systems involved in the preparation of strong earthquakes. The successful attempt of catalogue upgrading, accomplished using the NEIC Preliminary Determinations of Epicentres, appears to substantiate the robustness of the algorithm against changes in the catalogue.147 332 - PublicationOpen AccessTesting the Antelope software suite to realize a distributed seismic database among Austria, Northeastern Italy and Slovenia(2007-04-15)
; ; ; ; ;Horn, N.; ZAMG (Austria) ;Pesaresi, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Costa, G.; Università di Trieste ;Zivcic, M.; ARSO (Slovenia); ; ; ; ; ; ;Ritschel, B.; GFZ Potsdam (Germany) ;Fox, P.; UCAR (USA); Since 2002 the Zentralanstalt für Meteorologie und Geodynamik (ZAMG, http://www.zamg.ac.at/), the Centro di Ricerche Sismologiche (CRS, http://www.crs.inogs.it) of the Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), the Dipartimento di Scienze della Terra (DST, http://www.dst.univ.trieste.it/) of the Università di Trieste and the Agencija Republike Slovenije Za Okolje (ARSO, http://www.arso.gov.si/) are involved in the EU INTERREG IIIA project “Trans-national seismological networks in the South-Eastern Alps”. The Antelope software suite has been chosen as the common basis for real time data exchange, rapid location of earthquakes and alerting. The Antelope software suite has the capability to exchange data in real time among data centres: for this purpose the standard “orb2orb” software module is used. It uses a proprietary protocol and a point-to-point client/server architecture to exchange data. The last release of the Antelope software suite contains a more sophisticated version of this data exchange module: it is named “orbxchange”. “orbxchange” is a multithreaded version of “orb2orb” which supervises multiple “orb2orb” copies specified in a parameter file; it has the option of switching to alternate servers when no data is being copied from the primary. A distributed real time seismic database has been so established by connecting ZAMG, CRS/OGS, DST/UTS and ARSO Antelope servers with “orbxchange” modules. A test of the above described “orbxchange” features has been conducted artificially shutting down the Antelope servers and/or the data links between them: the results in the data coverage of the multiple copies of the distributed database will be shown. The expected improvement in data availability not only will be very useful for the institutional activities (like rapid earthquake location with magnitude estimation) of the four institutions involved in this test, but moreover its natural extension will be in more mission critical applications, like in public civil protection applications and rapid notification of inherent authorities.144 108 - PublicationRestrictedEmpirical Ground-Motion Prediction Equations for Northern Italy Using Weak- and Strong-Motion Amplitudes, Frequency Content, and Duration Parameters(2008-06)
; ; ; ; ; ; ;Massa, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Morasca, P.; Dip.Te.Ris., Università Genova ;Moratto, L.; Dip. Scienze della Terra, università Trieste ;Marzorati, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Costa, G.; Dip. Scienze della Terra, università Trieste ;Spallarossa, D.; Dip.Te.Ris., Università Genova; ; ; ; ; The goals of this work are to review the Northern-Italy ground-motion prediction equations (GMPEs) for amplitude parameters and to propose new GMPEs for frequency content and duration parameters. Approximately 10,000 weak and strong waveforms have been collected merging information from different neighboring regional seismic networks operating in the last 30 yr throughout Northern Italy. New ground-motion models, calibrated for epicentral distances ≤100 km and for both local (ML) and moment magnitude (Mw), have been developed starting from a high quality dataset (624 waveforms) that consists of 82 selected earthquakes with ML and Mw up to 6.3 and 6.5, respectively. The vertical component and the maximum of the two horizontal components of motion have been considered, for both acceleration (peak ground horizontal acceleration [PGHA] and peak ground vertical acceleration [PGVA]) and velocity (peak ground horizontal velocity [PGHV] and peak ground vertical velocity [PGVV]) data. In order to make comparisons with the most commonly used prediction equations for the Italian territory (Sabetta and Pugliese, 1996 [hereafter, SP96] and Ambraseys et al. 2005a,b [hereafter, AM05]) the coefficients for acceleration response spectra (spectral horizontal acceleration [SHA] and spectral vertical acceleration [SVA]) and for pseudovelocity response spectra (pseudospectral horizontal velocity [PSHV] and pseudospectral vertical velocity [PSVV]) have been calculated for 12 periods ranging between 0.04 and 2 sec and for 14 periods ranging between 0.04 and 4 sec, respectively. Finally, empirical relations for Arias intensities (IA), Housner intensities (IH), and strong motion duration (DV) have also been calibrated. The site classification based on Eurocode (hereafter, EC8) classes has been used (ENV, 1998, 2002). The coefficients of the models have been determined using functional forms with an independent magnitude decay rate and applying the random effects model (Abrahamson and Youngs, 1992; Joyner and Boore, 1993) that allow the determination of the interevent, interstation, and record-to-record components of variance. The goodness of fit between observed and predicted values has been evaluated using the maximum likelihood approach as in Spudich et al. (1999). Comparing the proposed GMPEs with SP96 and AM05, it is possible to observe a faster decay of predicted ground motion, in particular for distances greater than 25 km and magnitudes higher than 5.0. The result is an improvement in fit of about one order of size for magnitudes spanning from 3.5 to 4.5.364 29 - PublicationRestrictedImproved 2-D attenuation analysis for Northern Italy using a merged dataset from selected regional seismic networks(2010-06-09)
; ; ; ; ; ; ; ; ; ;Morasca, P.; University of Genova ;Massa, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia ;Laprocina, E.; University of Trieste ;Mayeda, K.; Weston Geophysical Corporation ;Phillips, S.; Los Alamos National Laboratory ;Malagnini, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Spallarossa, D.; University of Genova ;Costa, Gi.; University of Trieste ;Augliera, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; ; ; ; ; ; ; ; A merged, high-quality waveform dataset from different seismic networks has been used to improve our understanding of lateral seismic attenuation for Northern Italy. In a revious study on the same region, Morasca et al. (Bull Seismol Soc Am 98:1936–1946, 2008) were able to resolve only a small area due to limited data coverage. For this reason, the interpretation of the attenuation anomalies was difficult given the complexity of the region and the poor resolution of the available data. In order to better nderstand the lateral changes in the crustal structure and thickness of this region, we selected 770 earthquakes recorded by 54 stations for a total of almost 16,000 waveforms derived from seismic networks operating totally or partially in Northern Italy. Direct S-wave and coda attenuation images were obtained using an amplitude ratio technique that eliminates source terms from the formulation. Both direct and early-coda amplitudes are used as input for the inversions, and the results are compared. Results were obtained for various frequency bands ranging between 0.3 and 25.0 Hz and in all cases show significant improvement with respect to the previous study since the resolved area has been extended and more crossing paths have been used to image smaller scale anomalies. Quality-factor estimates are consistent with the regional tectonic structure exhibiting a general trend of low attenuation under the Po Plain basin and higher values for the Western Alps and Northern Apennines. The interpretation of the results for the Eastern Alps is not simple, possibly because our resolution for this area is still not adequate to resolve small scale structures.355 25 - PublicationOpen AccessThe usage of Antelope for acquiring end exchanging data in South-Eastern Alps: present configuration and future perspectives(2010-09-06)
; ; ; ; ; ; ; ; ;Bragato, Pier Luigi; OGS, CRS Department ;Costa, Giovanni; Università di Trieste, Dipartimento di Geoscienze ;Horn, Nikolaus; ZAMG ;Pahor, Jurij; ARSO ;Pesaresi, Damiano; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Lenhardt, Wolfgang; ZAMG ;Suhaldoc, Peter; Università di Trieste, Dipartimento di Geoscienze ;Zivcic, Mladen; ARSO; ; ; ; ; ; ; ; ; ; ;Pesaresi, Damiano; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Sleeman, Reinoud; ORFEUS; In the period 2002-2006 the Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS) in Udine (Italy), the Zentralanstalt für Meteorologie und Geodynamik (ZAMG) in Vienna (Austria), the Dipartimento di Geoscienze (DiG) of the Trieste University in Trieste (Italy), the Agencija Republike Slovenije za okolje (ARSO) in Ljubljana (Slovenia) and the Protezione Civile della Regione Autonoma Friuli Venezia Giulia (PCFVG) in Palmanova (Italy) were involved in the EU INTERREG IIIA project “Seismological Networks Without Frontiers in the Southeastern Alps”. ZAMG is involved in the EU INTERREG IIIA project “FASTLINK”, together with the Protezione Civile della Provincia autonoma di Bolzano (Italy) and the ETH of Zurigo (Swizerland). The commercial Antelope-software suite from BRTT (Boulder Real Time Technologies - www.brtt.com) has been chosen as the common basis for real time data exchange, rapid location of earthquakes and alerting. Each institute contributes to the seismological monitoring in the South-Eastern Alps by sharing data from its seismic network. Antelope is a powerful software suite that easily allows sharing data in real-time among several institutions by means of its module ‘orb2orb’. The current Antelope setup of all institutions involved in data acquisition, sharing and archiving is described, together with the future evolution of the project. The border region of Slovenia, Austria and NE Italy has experienced several destructive earthquakes in the past. Different seismic networks are operating in the area supporting monitoring, alerting and research. The example of recent strong earthquakes demonstrated that the integration of services provided by the neighboring networks is essential for a rapid and efficient intervention.250 514