Study on Method for Evaluating 3-Component of S-Waves in Sedimentary Layers

Abstract eng:
In the study of Kyuke et al. (2010), we proposed a method of evaluating the vertical motion of S-waves, which has been an issue in estimating 3-component waves, by assuming the simultaneous incidence of SV-waves and P-waves in the seismic basement. Using deep borehole records down to the seismic basement, we showed that our proposed method could better predict the observed records than the estimated results by the conventional method, which assuming the oblique incidence of SV-waves in the seismic basement. However, in some period bands of the simulation results, the simulation accuracy is slightly inferior. In this study, in order to improve the simulation accuracy, we focused on the estimation method of the incident wave. Generally, only the deepest sensor’s records are used, when the incident wave of the vertical array records was estimated based on the 1-D multiple reflection theory. However, there is a possibility that the estimated incident wave is distorted, because the incident wave can fully predict the record of the deepest sensor, although the assumed ground model might include an error. Thus, in this study, we introduced a new technique to the method of Kyuke et al. (2010). The new technique estimates the incident wave in the seismic basement using all of the array records. Further, this method was extended to the SH incident wave. Then, we simulated the 3-component records of a deep borehole down to the seismic basement. We confirm that these results are more consistent with the observed records than the conventional approaches.

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