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  • 1
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    Regional body-wave attenuation using a coda source normalization method: application to MEDNET records of earthquakes in Italy (2007)
    American Geophisycal Union
    Details
    Publication Date: 2017-04-03
    Description: We develop a new methodology to determine apparent attenuation for the regional seismic phases Pn, Pg, Sn, and Lg using coda-derived source spectra. The apparent Q, combining path and site attenuation, is determined from the difference between the geometrical spreading-corrected amplitude and the independently determined source spectra derived from the coda methodology. We apply the technique to 50 earthquakes with magnitudes greater than 4 in central Italy as recorded by MEDNET broadband stations around the Mediterranean at local-to-regional distances. A power law attenuation of the form Q(f) = Qof^gamma fit all the phases quite well over the 0.5 to 8 Hz band. The measured apparent Q values are quite repeatable from event to event. Finding the attenuation function in this manner guarantees a close match between inferred source spectra from direct waves and coda techniques. This is important if coda and direct wave amplitudes are to produce consistent seismic results.
    Description: Published
    Description: L10308
    Description: 3.1. Fisica dei terremoti
    Description: JCR Journal
    Description: reserved
    Keywords: wave propagation ; 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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    Treatment of ground-motion predictive relationships for the reference seismic hazard map of Italy (2008)
    springer
    Details
    Publication Date: 2017-04-03
    Description: In the framework of the 2004 reference seismic hazard map of Italy the amplitude of the strong-motion (expressed in terms of Peak Horizontal Acceleration with 10% probability of non-exceedence in 50 years, referred to average hard ground conditions) was computed using different predictive relationships. Equations derived in Italy and in Europe from strong-motion data, as well as a set of weak and strong-motion based empirical predictive relationships were employed in a logic tree procedure, in order to capture the epistemic uncertainty affecting ground-motion attenuation. This article describes the adjustments and conversions required to eliminate the incompatibilities amongst the relations. Particularly significant are distance conversions and style-of-faulting adjustments, as well as the problems related to the use of regional relations, such as the selection of a reference depth, the quantification of random variability and the strong-motion prediction. Moreover, a regional attenuation relationship specific for volcanic areas was also employed, allowing a more realistic evaluation of seismic hazard, as confirmed by the attenuation of macroseismic intensities.
    Description: Published
    Description: 295-316
    Description: 4.2. TTC - Scenari e mappe di pericolosità sismica
    Description: JCR Journal
    Description: reserved
    Keywords: epicentral and Joyner-Boore distance ; epistemic uncertainty, ; predictive relationships ; seismic hazard mapping ; scaling laws ; volcanic regions ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    Il terremoto di Haiti del 12 Gennaio 2010 (Mw 7.0) (2011)
    Federazione Italiana di Scienze della Terra
    Details
    Publication Date: 2017-04-04
    Description: Il terremoto di Haiti del 12 gennaio 2010 (Mw 7.0) si è verificato alle ore 16:53:09 locali (21:53:09 UTC). L’epicentro è stato localizzato a circa 25 chilometri da Port-au-Prince, la capitale, con una profondità ipocentrale di 13 km (fonte United States Geological Survey, USGS). USGS ha localizzato sei repliche nelle due ore successive al terremoto principale, di magnitudo compresa tra 4.5 e 5.9. (5.9, 5.5, 5.1, 4.8, 4.5, e 4.5). Nelle prime nove ore successive all’evento principale, sono state registrate 26 repliche di magnitudo M ≥ 4.2, dodici delle quali di magnitudo M ≥ 5.0.
    Description: Published
    Description: 42-46
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: N/A or not JCR
    Description: open
    Keywords: HAITI ; TERREMOTO 12 GENNIO ; 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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