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http://hdl.handle.net/2122/4003
Authors: | Petrosino, S.* De Siena, L.* Del Pezzo, E.* |
Title: | Recalibration of the Magnitude Scales at Campi Flegrei, Italy, on the Basis of Measured Path and Site and Transfer Functions | Journal: | Bulletin of the Seismological Society of America | Series/Report no.: | 4/98 (2008) | Publisher: | Seismological Society of America | Issue Date: | Aug-2008 | DOI: | 10.1785/0120070131 | URL: | http://www.bssaonline.org/cgi/reprint/98/4/1964?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&author1=petrosino&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT | Keywords: | magnitude Campi Flegrei |
Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous | Abstract: | New duration-based local (ML) and moment (Mw) magnitude scales are obtained for the Campi Flegrei area through analysis of a dataset of local volcanotectonic earthquakes. First, the S-wave quality factor for the investigated area was experimentally calculated, and then the distance-correction curve, log A0(r), to be used in the Richter formula ML = log Amax − log A0(r), was numerically estimated by measuring the attenuation properties and, hence, propagating a synthetic S-wave packet in the earth medium. The local magnitude scale was normalized to fit the Richter formula that was valid for Southern California at a distance of 10 km. ML was estimated by synthesizing Wood–Anderson seismograms and measuring the maximum amplitude. For the same dataset, the moment magnitude was obtained from S-wave distance-corrected and site-corrected displacement spectra. Comparisons between local and moment magnitudes determined, along with the old duration magnitude (MD) routinely used at the Istituto Nazionale di Geofisica e Vulcanologia– Osservatorio Vesuviano, are presented and discussed. Moreover, the relationships between ML and Mw calculated for two reference sites are also derived. |
Appears in Collections: | Article published / in press |
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Petrosino_BSSA_1964.pdf | article | 471.85 kB | Adobe PDF | View/Open |
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