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一、引言一九六二年三月十九日凌晨,在广东省河源县新丰江大坝附近发生了6.1级地震,震源深度约5公里.由于这次地震发生具有特殊的时间和空间背景,所以研究它的形成条件尤有重要意义.许多地震工作者通过现场大量研究指出,6.1级主震及较强余震是构造应力场作用的结果。但是,对作用方式及量级变化却有多种不同的认识。构造应力场是地壳中产生和正在作用的、并与其一定构造单元发展有关的应力综合。本
I. INTRODUCTION A magnitude 6.1 earthquake near the Xinfengjiang Dam in Heyuan County, Guangdong Province, occurred in the wee hours of March 19, 1962, with a focal depth of about 5 km. Due to the special time and space background of the earthquake , So it is of great significance to study its formation conditions.Many earthquake workers through a large number of field research pointed out that 6.1 magnitude main shock and strong aftershocks are the result of tectonic stress field. However, there are many different perceptions about the mode of action and magnitude changes. The tectonic stress field is produced by the earth’s crust and is acting and related to the development of a certain tectonic unit. this