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| | Abstract | | Characteristics of long-period earthquake ground motions in the Tokyo metropolitan area observed during aftershocks of the 2011 Tohoku Region Pacific Coast Earthquake are discussed through numerical simulation in this study. First, we confirmed the characteristics of observed aftershock and induced earthquake records based on the source direction. Then, we reproduced aftershock and induced earthquake records using ground motion simulation of finite difference method considering 3D subsurface structure from the sources to the basin, and considered whether we could confirm same characteristics of observed records. As a result, some earthquake simulations were not good reproduction of spectral ratios of records between the surface and borehole. On the other hands, variations of synthetic spectral ratios of records between the surface and borehole based on the source direction were confirmed. |
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