The dataset consists of 158 earthquakes recorded at 16 broadband (20 sps) three-component stations of the BDSN between 1992 and 2004. The wide distribution of data parameters allows for sensitivity testing. We calculate by fitting the power-law model, using five different methods. The first two methods use the seismic coda to correct for the source effect. The last three methods use a spectral ratio technique to correct for source, and possibly site effects.
The coda normalization (CN) method uses the local shear-wave coda as a proxy for the source and site effects, thus amplitude ratios remove these two effects from the S-wave spectrum ( Aki, 1980; Yoshimoto et al., 1993). The coda-source normalization (CS) method uses the stable, coda-derived source spectra to isolate the path attenuation component of the spectrum ( Walter et al., 2007). The two-station (TS) method takes the ratio of recorded at two different stations along the same narrow path from the same event in order to remove the common source term (e.g., Chavez and Priestley, 1986; Xie and Mitchell, 1990). The reverse two-station (RTS) method uses two TS setups, where a source is on either side of the station pair in a narrow azimuthal window ( Chun et al., 1987). The two ratios are combined to remove the common source and site terms. The source-pair/receiver-pair (SPRP) method is the RTS method with a relaxation on the narrow azimuthal window requirement ( Shih et al., 1994).
Berkeley Seismological Laboratory
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