2012年5月28日唐山M_S4.8地震震源机制解和震源深度精确测定  

Acurate Determination of the Focal Mechanism and Depth of the 28 March 2012 Tangshan M_S4.8 Earthquake

作　　者：李赫[1] 张辉[2] 王熠熙[1] 王丽霞[2] 王宝锁[1] 高也[1] 蔡玲玲[3] 王莉婵 李冬圣[3] LI He ZHANG Hui WANG Yi-xi WANG Li-xia WANG Bao-suo GAO Ye CAI Ling-ling WANG Li-chan LI Dong-sheng(Earthquake Administration of Tianjin, Tianjin 300201, China Earthquake Administration of Gansu Province, Lanzhou 730000, China Earthquake Administration of Hebei Province, Shijiazhuang 050021, China)

机构地区：[1]天津市地震局,天津300201 [2]中国地震局兰州地震研究所,甘肃兰州730000 [3]河北省地震局,石家庄050021

出　　处：《地震》2017年第3期107-116,共10页Earthquake

基　　金：中国地震局地震科技星火计划(XH16006Y);中国地震局地震科技星火计划攻关项目(XH15042);中国地震局震情跟踪定向工作任务(2017010304)共同资助

摘　　要：本文采用2012年5月28日唐山M_S4.8地震的宽频带波形资料,利用CAP方法反演得到该地震震源机制解和震源深度,在此基础上,结合多种深度震相对震源深度进行精确测定。结果显示:唐山MS_4.8地震是略带正断分量的走滑型地震。最佳双力偶解节面Ⅰ走向139°、倾角79°、滑动角-17°;节面Ⅱ走向232°、倾角73°、滑动角-169°;最佳震源深度为10km,属于浅源地震。从震中位置和震源机制解来分析,此次地震发震断层可能为唐山断裂。To get accurate seismic parameters, we used the broadband waveforms data of the Tangshan Ms4.8 earthquake on March, 28, 2012 and the cut-and-paste （CAP） method to obtain the best focal mechanism. And then, combined with a variety of depth phases, we accurately determined the focal depth. The results show that, the earthquake is tension and strike slip. The best double couple solution is 139°, 79° and -17° for strike, dip and slip angles respectively for one nodal plane, and 232°, 73° and -169° for another. The estimated focal depth is 10 km. According to the epicenter and the focal mechanism, This earthquake likely occurred on the Tangshan Fault.

关 键 词：震源机制解 震源深度 CAP方法 深度震相 2012年唐山Ms4.8地震 

分 类 号：P315.7[天文地球—地震学]