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Bulletin of the Seismological Society of America; August 2008; v. 98; no. 4; p. 1964-1974; DOI: 10.1785/0120070131
© 2008 Seismological Society of America
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Recalibration of the Magnitude Scales at Campi Flegrei, Italy, on the Basis of Measured Path and Site and Transfer Functions

Simona Petrosino, Luca De Siena, and Edoardo Del Pezzo

Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli Osservatorio Vesuviano, Via Diocleziano, 328, 80124 Naples, Italy

New duration-based local (ML) and moment (Mw) magnitude scales are obtained for the Campi Flegrei area through analysis of a dataset of local volcano-tectonic earthquakes. First, the S-wave quality factor for the investigated area was experimentally calculated, and then the distance-correction curve, logA0(r), to be used in the Richter formula ML=logAmax–logA0(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.




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A. Bobbio, M. Vassallo, and G. Festa
A Local Magnitude Scale for Southern Italy
Bulletin of the Seismological Society of America, August 1, 2009; 99(4): 2461 - 2470.
[Abstract] [Full Text] [PDF]


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