区域地震范围内地壳介质的低频响应

本文对于计算P_nl波格林函数的广义地震射线方法进行了改进。包括:1.简化了地震射线的描述方法;2.将射线按其运动学相似性进行分组计算,从而较大地提高了计算速度;3.进一步推广用于计算SH波部分的响应。对于1983年山东菏泽地震和1985年云南禄劝地震,用综合地震图方法模拟了763型长周期地震仪的P_nl波记录,求出两个地震的断层面解答,其结果与有关研究所得该地区构造应力场的图象基本一致。

LOW-FREQUENCY RESPONSE OF THE CRUSTAL MEDIA AT REGIONAL RANGES

In this paper some modifications to generalized ray theory are made for generating the Pnl Green's functions. The major improvements are as follows: (1) The method to describe seismic rays are simplified: (2) The rays are grouped on the basis of the kinematical similarity, thus the computation speed is highly increased; (3) This technique is extended to calculate the response of the SH waves. For the Heze (Shandong, 1983) and Luquan (Yunnan, 1985) earthquakes, PJ waveforms recorded on the 763 long-period seismographs are modeled by the use of synthetic seismograms. The fault plane solutions yielded for these two earthquakes agree with patterns of the tectonic stress field.