Estimation of a 3D basin model around the fault area of the 2004 Mid Niigata prefecture earthquake using simulation of earthquake ground motion from small events

  • Kasamatsu Kentaro
    Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology Present: Kajima Technical Research Institute
  • Yamanaka Hiroaki
    Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

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  • 中小地震の地震動シミュレーションによる2004年新潟県中越地震震源域の深部地盤構造モデルの構築
  • チュウショウ ジシン ノ ジシンドウ シミュレーション ニ ヨル 2004ネン ニイガタケン チュウエツ ジシン シンゲンイキ ノ シンブ ジバン コウゾウ モデル ノ コウチク

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Abstract

 A 3D basin model around the fault area of the 2004 Mid Niigata prefecture earthquake (MJ6.8) was constructed using filtered gravity data and S-wave profiles derived from microtremor array observations. We validate the appropriateness of the 3D model using the simulation of earthquake ground motions from aftershocks events with MJ of 4.3 and 6.1. The major features of the ground motions from aftershocks are well simulated in the synthetic motion. Then, strong ground motions from the main shock are calculated using the basin model and irregular fault rupture model. Furthermore, we estimate distributions of the peak ground velocities for the main shock.<br>

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