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| | Abstract | | In surface wave analysis, less attention has been paid to amplitude information although phase information has been utilized for estimating S-wave velocity structures. To analyze amplitude information effectively, we propose a method for estimating lateral variation of surface attenuation coefficients from multichannel seismic data. In the proposed method, the concept of CMP crosscorrelation analysis for estimating lateral variation of phase velocities is extended to extract surface wave attenuation. We apply the proposed method to field data acquired in Saijo city, Ehime Prefecture. As a result, abrupt change in lateral variation of the estimated attenuation coefficients is correlated with the fault locations in the studied area. This result indicates lateral variation associated with lithological variation or discontinuities can be estimated by two-dimensional analysis of surface wave attenuation coefficients. Moreover, we demonstrate that by analyzing attenuation coefficients with phase velocities, it can be possible to distinguish between lithological variation and sharp discontinuities. |
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