2016年8月21日—10月24日河北开平M_L 4.7震群分析  

Analysis of Hebei Kaiping earthquake swarm from August 21th to October 24th, 2016

作　　者：郭蕾[1] 宫猛[1] 王晓山[1] 王想[1] 王亚茹[1] 陈婷[1] Guo Lei;Gong Meng;Wang Xiaoshan;Wang Xiang;Wang Yaru;Chen Ting(Hebei Earthquake Agency,Shijiazhuang 050021,China)

机构地区：[1]河北省地震局,中国石家庄050021

出　　处：《地震地磁观测与研究》2018年第6期37-44,共8页Seismological and Geomagnetic Observation and Research

基　　金：地震科技星火计划(项目编号:XH17007);河北省地震局星火项目(项目编号:DZ20170509039;DZ20170109002;DZ20180319008)

摘　　要：2016年8月21日17时15分,河北省唐山市开平区(39.70°N,118.35°E)发生M_L3.5地震,震源深度6km。据河北省快报目录,8月21日至10月24日共发生可定位小震694次,最大地震为9月10日M_L4.7地震。计算本次震群序列参数,分析其物理特性。精定位结果显示,M_L 4.7震群集中在唐山—古冶断裂,属唐山老震区余震活动。与该区同等震级地震相比,震群中几次3级以上地震视应力水平较低,震源机制一致性较好,表明该区存在较为一致的稳定应力场。震群活动显示,该震群为非典型前兆性震群。分析结果对正确了解此次震群特征及判断序列发展趋势具有较高的帮助作用。At 17:15 on August 21th,2016,an ML 3.5 magnitude earthquake occurred in Kaiping District,Tangshan City,Hebei Province (39.70°N,118.35°E) with a focal depth of 6 km.According to the Hebei Express List,from August 21 to October 24,there were 694 small earthquakes that could be located.In this article,the parameters of the earthquake swarm sequence are calculated and its physical characteristics are analyzed.The fine location results show that the ML 4.7 earthquake cluster in the Tangshan-Guye fault and it still belongs to the aftershocks of the Tangshan old earthquake area.The magnitude of the apparent stress of earthquakes above magnitude 3 in the earthquake swarm is lower than that of earthquakes of the same magnitude in the area,and the consistency of the focal mechanism is good,indicating that there is a consistent and stable stress field in this area.The swarming activity shows that the swarm is an atypical precursory swarm.Analysis results is helpful for correctly understanding the characteristics of the earthquake swarm and correctly judging earthquake tendency.

关 键 词：序列参数 物理特性 精定位 视应力 震源机制 

分 类 号：P315[天文地球—地震学]