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| | Abstract | | It is effective to directly predict earthquake ground motions using P-waves on the surface for earthquake early warnings. In this study, we evaluated the influence of site amplifications by velocity structures on relationships between P-waves and S-waves on the surface using seismic records of KiK-net stations in and around Kanto Basin. By evaluating relationships of peak amplitudes, we demonstrated that site amplifications by velocity structures more strongly affect relationships between P-waves and S-waves on the surface than source and path effects. In addition, we confirmed that correlation coefficients between peak amplitudes of P-waves and S-waves observed on the surface have almost the same range as those in deep boreholes because both relationships between P-waves and S-waves on the surface and those in deep boreholes are affected by the variability of radiation patterns and propagation paths by individual earthquakes. |
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