| 講演要旨(和文) | | 2004年中越地震の本震と余震観測点において，微動アレイ探査および連続微動観測を実施し，S波速度構造モデルの推定を試みた．小千谷市内では表層地盤のS波速度構造には変化がみられ，AVS30はK-NET小千谷が最も小さいことがわかった．川口町は，小千谷市内に比べてAVS30が大きいことが分かった．2004年10月24日の余震によるPGA，PGVおよび震度とAVS30には明らかな相関があるとは言いにくい．深部地盤との関係について調べることが今後の課題である． |
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| | 講演要旨(英文) | | We performed micorotremor array measurement and continuous microtremore measurement to estimate S-wave velocity structure in Ojiya city, Niigata prefecture, Japan. We estimated S-wave velocity structure model for shallow soil at temporary strong motion stations which observed strong motions due to the M6.1 aftershock of the 2004 Mid Niigata prefecture earthquake. To understand the variety of strong ground motions in Ojiya city, we compared shallow soil and seismic intensities, but there was no clear correlation between average velocity of 30m depth and seismic intensities of strong ground motions due to the aftershock. Further analysis on deep sedimentary layers is necessary to understand variety of ground motions. |
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