A Study on Evaluation Method for Spatial Variation of Ground Motions Based on the Ground Heterogeneity

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  • KOBAYASHI Genyuu
    Regulatory Standard and Research Department Secretariat of Nuclear Regulation Authority
  • MAMADA Yutaka
    Regulatory Standard and Research Department Secretariat of Nuclear Regulation Authority

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  • 地盤不均質性に基づく地震動の空間変動の評価に関する検討

Abstract

<p>In order to clarify the spatial variation of the ground motions, we carried out verification tests for evaluation of the spatial variation of the ground motions using high-density horizontal array observation records of 10 observation points in the Quaternary ground having a substantially horizontal geological structure. As part of the verification tests, we performed Monte Carlo simulations using two-dimensional heterogeneous ground models estimated from the in-situ ground data, and attempted to estimate the spatial variation of the ground motions. As a result, based on the ground heterogeneity obtained from the in-situ ground survey, it is possible to estimate the spatial variation characteristics (spatial correlation coefficient, variation) of the ground motions in the local ground with a range from several meters to 200 meters.</p>

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