3D S-wave velocity model of Kanto basin for long-period ground motion simulation with special focus on treatment of shallow near-surface part

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  • 表層部分に注目した地震動シミュレーションのための関東平野の3次元S波速度深部地盤モデル
  • ヒョウソウ ブブン ニ チュウモク シタ ジシンドウ シミュレーション ノ タメ ノ カントウ ヘイヤ ノ 3ジゲン Sハ ソクド シンブ ジバン モデル

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Abstract

 A 3D S-wave velocity model for the Kanto sedimentary basin, Japan, is reconstructed using 1D structure data by the results of microtremor array explorations. This new model is reduced the presumption region with compilation added new explorations in the northern part of Kanto plain in the target model area. Then we simulated the long-period ground motion during a moderate earthquake of near the Izu-Oshima in 1990 using the basin 3D model. This new model was able to explain the ground motion records during the target earthquake as same as the previous one, and it led to the improvement of the reproducibility of the observed waveform in not only the area around Tokyo Bay but also the other parts in the plain. Especially, the effect of regional distribution of the S-wave velocity in the top layer of the basin model was investigated. Especially, the necessity of careful consideration was pointed out in modeling the top layer with low velocity and thin in case of finite difference modeling for long-period ground motion.<br>

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