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Authors: | Walter, W.* Mayeda, K.* Malagnini, L.* Scognamiglio, L.* |
Title: | Regional body-wave attenuation using a coda source normalization method: application to MEDNET records of earthquakes in Italy | Journal: | Geophysical Research Letters | Series/Report no.: | / 34(2007) | Publisher: | American Geophisycal Union | Issue Date: | 2007 | DOI: | 10.1029/2007GL029990 | Keywords: | wave propagation | Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring | Abstract: | 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. |
Appears in Collections: | Article published / in press |
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