Abstract
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.
