北京及邻区微震活动的初步分析

The primary analysis of small earthquake activity in Beijing and its surrounding region

通过对北京遥测地震台网近年来记录到的北京及邻区地震的震中分布、地震活动频度及能量释放强度的分析，得到本区地震活动在时间分布上具有＂聚堆性＂。在年发震频度、地震强度和能量释放方面均具有双峰值特征，并且具有较好的一致性和同步性。在空间分布上具有条带特征，且形成北东～南西和北西～南东的两条相互交汇的条带。又通过统计分析得到本区发震概率最大的时间段是每年的１０月前后，而地震主要发生在北西～南东带上。

Analyzing the distribution, frequency and energy release intensity of earthquake events in Beijing and its surrounding region, recently recorded by Beijing Telemetric Seismic Network,this paper found the 'congregation feature' of time distribution of earthquake activity in this region. The number of earthquakes in a year, earthquake intensity and energy release all had double-peak values, and they were of better identity and synchronous characteristics. These events showed that the earthquake belt feature,and formed two intersecting belts, one belt for Northeast-Southwest dirction,another one for Northwest-Southeast direction. From statistical analysis, the time of maximum triggering earthquake probability is about in October every year in this region. Earthquakes mainly occurred on the Northwest-Southeast belt.