A Technique for Empirical Estimation of Non-Stationary Site Effects of Ground Motions Using the Meyer-Yamada Wavelet

Abstract eng:
We propose a new technique for evaluating empirical site effects in time domain, extending the concept of Birgören and Irikura (2005). They developed a method for estimating site effects in time domain using the Meyer-Yamada wavelet. They evaluated coherent site effects by averaging wavelet coefficients for many seismic records. After that, Akazawa and Irikura (2007) improved reliability of the procedure by automatic synchronization of the S-wave phases. However, site effects consist of coherent and incoherent signals. For this reason, their procedures that use simple averaging, lead to an underestimation of the site effects. In this study, we propose a new averaging technique to evaluate both the coherent and incoherent signals. The applicability of the proposed technique is demonstrated for log sweep wave and the observed seismic records.

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