가진기를 활용한 지진동 증감폭비 추정

초록

Seismic waves are amplified by site effects on soft ground. A sinusoidal force is applied by a shaker on the surface at the GUWB KMA site. The ground motion occurred by the shaker is observed at the borehole accelerometer and at the mobile velocimeter on surface. This set of ground motion pairs can be used to evaluate site effects by analyzing their Fourier amplitude ratios. This study intends to verify the proposed method by comparing Fourier amplitude ratios from ambient noises, earthquake records, motions induced by the shaker, and 1D site response analysis.