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About the use of coda wave signals to estimate local site amplification factors


, : About the use of coda wave signals to estimate local site amplification factors. Pages 523-530 1998

Several methods were developed to estimate the local site amplifications from weak or moderate size earthquake recordings. Most techniques are based on the calculation of spectral ratios (classical spectral ratio, generalized inversion, Phillips and Aki's Coda wave method, 1986) using either S-wave signals, Coda wave signals or a complete recording (P-waves, S-waves and Coda). The differences due to the different signal contributions are not very well understood. In several studies important variations of the estimated amplifications are obtained only due to different choices of the analyzed windows of the same data. In this work, we discuss the differences between estimates based on S-wave and Coda signals depending on the method. Taking into account different window contents and methods, we show that the results of various studies presented in the literature are more consistent than it actually appears. As a general trend, the estimates based on the Coda wave give higher estimates of the amplification level than using the classical spectral ratio technique applied on the S-wave signal. The estimates obtained using the classical spectral ratio technique from the Coda wave signals of only one window overestimate systematically the local site amplification while the mean-estimates obtained from several moving windows using Phillips and Aki's Coda wave method are in better accordance with the classical estimates using one S-wave window. The correct choice of the data window is consequently a necessary basis for every reliable estimation of local site amplification. Our statements are confirmed by a direct comparison of estimates obtained from different methods (classical spectral ratio technique using S-wave and Coda wave signals, Phillips and Aki's Coda wave method) on two data sets: EURO-SEISTEST (test-site near Thessaloniki, Greece) and Borrego Mountains array (California).

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