摘要
1991年9月28日至10月上旬在北京市平谷县马坊地区出现了一些小地震活动,其中包括9月28日北京时间08时37分和18时48分相继发生的两次M_L=4.0地震。本文叙述了这两次地震的宏观调查结果和使用数字地震台网进行近场监测的情况。利用这些小地震活动期间所得到的数字记录确定了4次小地震震源的精确位置,利用矩张量反演方法求解了这几个地震的震源机制。根据研究的结果判断这些地震是马坊—夏垫断裂带北部的构造运动。
Small earthquake activity occurred in the Mafang area, Pinggu County, Beijing, during the period of from late September to the first ten days of October, 1991, including two earthquakes with magnitude M_L=4.0 on September 28 at 08~h37~m and 18~h48~mPKT consecutively. This paper describes the macroscopic investigation and the use of digital seismic network for near-field mon toring. Some digital records were obtained from 4 small earthquakes, precise hypocenter locations were determined from arrival times and focal mechanisms obtained using the moment tenser inverse method. It is certain that this swarm is due to activity of the northern part of Mafang-Xiadian fault.
出处
《地震地磁观测与研究》
1992年第2期8-14,共7页
Seismological and Geomagnetic Observation and Research
关键词
震源
位置
震源机制
地震活动
Hypocenter
Focal machanisms
Moment tenser inversion
Mafang
