一、前言地壳中存在有许多裂隙,它们是在优势取向下呈杂乱无章地分布。震源的形成过程就是这些杂乱无章分布于形变岩体内大量裂隙增长的过程。由于这些裂隙的相互作用,使产生裂隙的区域形成一个狭长地带,最后在这个地带内发生了导致地震的主断裂。一般说来,是由于裂隙的增长产生了许多弱震活动;导致地震 I. INTRODUCTION There are many fractures in the earth’s crust. They are disorganized and distributed under the dominant orientation. The formation process of the hypocenter is the process of the growth of a large number of fractures in the deformed rock mass. Due to the interaction of these fractures, the area where the fractures develop is formed into a narrow zone, and finally the main fault that caused the earthquake occurs in this zone. In general, many weak earthquakes are caused by the growth of fractures; they lead to earthquakes