Evaluation of Amplification Characteristics in Subsurface Structure with Inclined Bedrock based on Inversion of Autocorrelation Functions of Ground Seismic Motions

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  • 地表の地震動の自己相関関数の逆解析に基づく傾斜基盤構造の増幅特性の推定

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This paper presents an evaluation of amplification characteristics in subsurface structure with inclined bedrock based on inversion of autocorrelation functions of ground seismic motions that are easily observed. If a 1D structure is known and an autocorrelation function of a correct 2D model is a target, we perform a grid search for an inclined angle and a damping factor with 2D-FEM analysis. Amplification characteristics of the optimized model show good agreement with the correct answer at a virtual site. Then, we apply the evaluation method to actual sites and confirm its effect. Autocorrelation functions of observed records correspond with those of 1D model in a horizontally layered site and with those of 2D model in an inclined bedrock site.

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