用余震数据研究震区应力状态的一种计算机处理方法

使用全面搜索和优化处理相结合的方法,由一组余震的P波初动解资料可以推断出余震区的构造应力的主轴方向,应力主值的相对大小(1),并同时确定了余震的两个P波节面中的断层面。对1976年唐山地震相1966年邢台地震的余震资料的计算处理,都给出了余震区的主压应力为水平东西向,主张应力为近水平南北向的结果。因此可以认为,本方法对于用地震资料研究应力场是一个有用的工具。

A Computative Method for the Study of the Tectonic Stress Field of Earthquake Area Using Aftershock Data

Combining the method of all-space finding with optimal processing, this paper infers the directions of three principal stress axes and the relative ratio of the principal stress value and the fault plane from two P-waves nodal by uisng a group of the P-waves' first motion solution. The result dealing with the aftershock data of Tongshan and Xingtai earth-quakes give that the principal compressional stress axis is horizonal, trending E-W, and the principal tensile stress axis is approximately horizonal with N-S trending. These results are consistent with that of other methods. So we would say that our method is a effective tool to study the tectonic stress field by using she earthquake data.