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We examined an evaluation method of the vertical component of S-waves part in sedimentary layers, assuming simultaneous incidence of P-wave and SV-wave. In order to improve the simulation accuracy, we focused on the estimation method of the incident wave, and introduced a new technique that estimates the incident wave using all of the vertical array records. Then, we simulated the records at an observation point where vertical array observation down to the seismic basement has been conducted at 6-depths. As to the transfer function and response spectrum, simulation results of vertical component were shown to be better consistent with the observed value than the results of SV-wave oblique incidence or P-wave vertical incidence. Furthermore, in order to confirm the validity of this method, we examined the inferred incident wave. Using the incident waves at the above station, we simulated the records of nearby site. The calculated waves have well explained the observed records of both the vertical and the radial component.

STUDY ON EVALUATION METHOD FOR VERTICAL SEISMIC GROUND MOTION IN S-WAVES CONSIDERING THE SIMULTANEOUS INCIDENCE OF SV-WAVE AND P-WAVE