Statistics – Methodology
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3410308w&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 10, CiteID L10308
Statistics
Methodology
3
Seismology: Body Waves, Seismology: Earthquake Ground Motions And Engineering Seismology, Seismology: Earthquake Source Observations (1240), Seismology: Seismic Monitoring And Test-Ban Treaty Verification, Seismology: Lithosphere (1236)
Scientific paper
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) = Q o f γ 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.
Malagnini Luca
Mayeda Kevin
Scognamiglio Laura
Walter William R.
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