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Regional body-wave attenuation using a coda source normalization method: application to MEDNET records of earthquakes in Italy (2007)

Walter, W. ; Mayeda, K. ; Malagnini, L. ; [weitere]

American Geophisycal Union

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Publikationsdatum: 2017-04-03

Beschreibung: 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.

Beschreibung: Published

Beschreibung: L10308

Beschreibung: 3.1. Fisica dei terremoti

Beschreibung: JCR Journal

Beschreibung: reserved

Schlagwort(e): wave propagation ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring

Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

Materialart: article

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Il terremoto di Haiti del 12 Gennaio 2010 (Mw 7.0) (2011)

Akinci, A. ; Malagnini, L.

Federazione Italiana di Scienze della Terra

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Publikationsdatum: 2017-04-04

Beschreibung: 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.

Beschreibung: Published

Beschreibung: 42-46

Beschreibung: 4.1. Metodologie sismologiche per l'ingegneria sismica

Beschreibung: N/A or not JCR

Beschreibung: open

Schlagwort(e): HAITI ; TERREMOTO 12 GENNIO ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous