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| | Abstract | | In our previous paper of 2008, we showed a possibility of examining S-wave velocity profile by analyzing P-to-SV reflected waves observed at one 3-component seismometer together with P-wave reflection profiling. Although the method proposed in the previous paper has ambiguity about obtaining S-wave velocity, the approach itself is attractive because one additional 3-component seismometer requires little additional cost. Last year we proposed another method based on fitting observed travel-time curves of P-to-SV waves on the receiver gather of the radial component to theoretical times calculated by using ray tracing, and showed the validity of the method for the model whose layer boundaries were horizontal. The variables in the method were the ratio of P-wave velocity to S-wave velocity and the reflection layer, because P-wave velocity structure was already known. Slowness of the reflected wave does not depend on S-wave velocity but on P-wave velocity at large offsets, which separated the effect of these two variables on the receiver gather. In this paper, we showed the validity of the method for models whose layer boundaries were inclined. This method is easy to apply without much time and effort, if P-wave velocity profile was already determined using vertical component reflection profiling. |
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