SOURCE MODELING USING THE EMPIRICAL GREEN'S FUNCTION METHOD AND STRONG GROUND MOTION ESTIMATION CONSIDERING NONLINEAR SITE EFFECT

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  • IKEDA Takaaki
    Division Chief, Research Institute of Technology, Tobishima Corporation, M. Eng.
  • KAMAE Katsuhiro
    Prof., Research Reactor Institute, Kyoto University, Dr. Eng.
  • IRIKURA Kojiro
    Adjunct Prof., Disaster Prevention Research Center, Aichi Institute of Technology, Dr. Sci.

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Other Title
  • 経験的グリーン関数法を用いた震源のモデル化と地盤の非線形性を考慮した地震動評価
  • An application to the 2005 West off Fukuoka prefecture earthquake and the 2007 Noto Hanto earthquake
  • 2005年福岡県西方沖の地震と2007年能登半島地震への適用

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For mitigating seismic damage of structures during disastrous earthquakes, we have to improve both the procedure for constructing source models for future earthquakes and the method for estimating strong ground motions. The empirical Green's function method (EGFM) is one of the most appropriate methods for estimating strong ground motions near source faults. We constructed the best-fit source models for observed data from the two inland earthquakes, the 2005 West-off Fukuoka earthquake and the 2007 Noto Hanto earthquake using the EGFM. We extended the EGFM to ground motion simulation at soft-layers sites, combining it with the nonlinear analysis in soft soil layers. As a result, the calculated motions on the ground surface underlain by soft layers agree reasonably well with the observed ones. It means that the EGFM is one of the most effective methods for predicting the strong ground motions at both soft-soil sites as well as hard-rock sites.

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