二维地表局部不规则区域对P、SV波传播的影响

EFFECT OF LOCAL SURFACE AND SUBSURFACE IRREGULARITIES ON THE PROPAGATION OF P,SV WAVES

本文将转换矩阵法加以推广,用来求解半空间表面局部不规则区域所引起的P、SV波的散射透射问题。计算讨论了孤突山丘和沉积谷地对地震波的放大作用,结果与实际震害调查中观测到的现象基本一致。

The transition matrix method is extended to study the scattering problem of P, SV waves in half-space with two-dimensional local surface or subsurface irregularity. The method presented here possesses the advantage of high accuracy with low computational cost as compared with the boundary element method. The amplification effect of hills and alluvial valleys on seismic waves is discussed. The results arc in agreement with those observed in earthquakes in China.