台湾费丛峡谷对强地面运动的影响研究──利用单台资料及2．5维SH混合方法

本文通过格林函数反褶积方法，由台湾峡谷附近的记录资料预测峡谷区的强地面运动的时程曲线．峡谷区的理论格林函数应用２．５维ＳＨ混合方法求解．通过格林函数反褶积方法得到的峡谷区费丛１及费丛２台的位移、速度、加速度和实际资料对比，取得了满意结果．计算结果表明，峡谷底部的峰值加速度相对峡谷边缘为最小；在靠近震中的一侧，峡谷的加速度的最大振幅相对比另一侧大．还给出了其余３个台的预测结果，研究了它们的加速度傅里叶谱和反应谱．

A STUDY OF THE EFFECTS OF THE FEITSUI CANYON TOPOGRAPHY ON THE GROUND STRONG MOTION──USING 2.5-D SH HYBRID METHOD AND THE STRONG MOTION RECORDS AT A STATION

A combination of the method of computing strong motion seismograms by the deconvolution of the theoretical Green functions and 2.5-D SH hybrid method is used to Compute the Synthetic seismograms in the damsite from the records observed at the station outside.The observed and the simulated ground motions at station Feitsui-1 and Feitsui-2 show good agreement in ground displacement,velocity and acceleration.Strong deamplification of accelarations is predicted at the trough of the canyon.Ground motions in the south side of canyon which is closer to epicenter have a larger peak values than those of another side.The synthetic seismograms in other three stations are also presented.There exists little difference between the Fourier amplitude spectea of predicted and observed ground motions.2.5-D SH hybrid method show a good application to the study of strong motion in this paper.