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Recalibration of the Magnitude Scales at Campi Flegrei, Italy, on the Basis of Measured Path and Site and Transfer Functions
Language
English
Obiettivo Specifico
1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
Status
Published
JCR Journal
JCR Journal
Title of the book
Issue/vol(year)
4/98 (2008)
Publisher
Seismological Society of America
Pages (printed)
1964-1974
Issued date
August 2008
Keywords
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.
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.
Type
article
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