ESTIMATION OF GROUND MOTION AT ARBITRARY POINTS USING TRANSFER FUNCTION BETWEEN TWO POINTS BASED ON SOIL MODEL AND STRONG MOTION RECORDS

Abstract

In order to apply Empirical Green's Function Method for strong motion prediction at arbitrary points where strong motion records are not available, we propose a new method to estimate ground motion at a site using observed record at nearby site and theoretically evaluated transfer functions between two sites. The transfer function is calculated from hybrid method composed of synthetic wave motions based on 3D-Finite Difference Method and 1D receiver effects that include radiation, propagation and site amplification effects of the P, SV and SH wave fields. The estimated transfer function by hybrid method between arbitrary two points shows good correspondence with that of observed ground motions at same points. The proposed method is verified at a site where strong motion records are available, where the observed records are well simulated compared to the conventional estimation methods such as 3D-F.D.M.