地震地磁观测与研究2025，Vol.46Issue(1)：29-36,8.DOI:10.3969/j.issn.1003-3246.2025.01.004
2020年唐山市古冶区MS 5.1地震震源机制解及地震活动性分析
Analysis of the focal mechanism solution and seismicity of the 2020 MS 5.1 earthquake in Tangshan,Hebei
摘要
Abstract
An MS 5.1 earthquake occurred on July 12,2020,in Tangshan,which was strongly felt in the Tangshan City.This earthquake may belong to the Tangshan MS 7.8 earthquake sequence in 1976.Based on ML>1 earthquakes of 2000-2021,the temporal and spatial scanning analysis of the b value of earthquakes in the focal region is carried out to obtain the seismicity characteristics and abnormal areas.In this study,the seismic records from Hebei and adjacent regions are used to invert the focal mechanism solution and focal depth of the MS 5.1 earthquake by the CAP method.The inversion results show that this earthquake mechanism was a right-lateral strike-slip fault.The moment magnitude is 4.9.The seismogenic fault is nodal I with strike,dip,and slip angles of 236.0°,77.0°,and-170.0°,respectively.关键词
唐山MS 5.1地震/CAP方法/震源机制解/b值/地震活动性Key words
Tangshan MS 5.1 earthquake/CAP method/focal mechanism solution/b value/seismic activity引用本文复制引用
刘丽,刘檀,马旭东,朱音杰,杜航..2020年唐山市古冶区MS 5.1地震震源机制解及地震活动性分析[J].地震地磁观测与研究,2025,46(1):29-36,8.基金项目
河北省地震科技星火计划项目红山野外站科研专项(项目编号:DZ2023120800016) （项目编号:DZ2023120800016）
