北京地区断层活动的阶段性特征

本文论述北京地区的断层活动特征,着重讨论断层活动的阶段性变化。其阶段性表现本区在1973年和1976年前后出现两次明显的转折。前一次转折,区域受力方式随之发生明显的改变。而后一次转折,区域受力方式并没有发生变化。这主要是唐山7.8级地震发生和发展所影响的结果

THE FEATURE OF THE FAULT ACTIVITIES BY STAGES IN THE BEIJING REGION

The fault activities in Beijing region show a changing feature by stages. For instance, there obviously appeared two turns in mode of fault movements for the study region in 1973 and 1976 respectively. The first one caused a substantial change of regional stress pattern, while the second did not do so. It is suggested that this faulting feature by stages is generated due to development and occurrence of the 1976 Tang-shan earthquake(M=7.8).