摘要
利用青海、西藏固定台站的宽频带波形数据,采用gCAP方法,对2016年10月17日青海杂多M_S6.2地震进行震源机制和矩心深度反演,并结合震中附近活动断裂分布和余震分布讨论了此次地震的发震构造。结果显示,2016年10月17日青海杂多M_S6.2地震的破裂面节面Ⅰ走向51°,倾角69°,滑动角-40°,节面Ⅱ走向171°,倾角56°,滑动角-144°,矩心深度为6km,矩震级为M_W5.9。分析本次地震发震断层可能为杂多—上拉秀断裂,地震发生时以拉伸分量为主,走滑分量为辅。
Utilizing the digital broad-band seismic records from Qinghai and Xizang seismic networks and the gCAP method,we inverse the focal mechanism and the centroid depth of the October 17 2016 M_S6.2 earthquake in Zadoi Qinghai and discuss the seismogenic structures combining with the distribution of active faults near the epicenter and aftershocks distribution.The results show that the nodal planeⅠ of the earthquake is 51°,69°,-40° for strike,dip and slip,whereas the nodal planeⅡ is 171°,56°,-144°,respectively.The centroid depth is 6 km and the moment magnitude is M_W5.9.After analyzing,the seismogenic fault of the main shock could be the Zadoi-Shanglaxiu fault,and the tensile component is the main factor in the earthquake while the strike slip one is the secondary.
出处
《国际地震动态》
2017年第9期12-17,共6页
Recent Developments in World Seismology
基金
中国地震台网中心青年科技基金(QNJJ201719)资助
关键词
杂多地震
gCAP方法
震源机制解
羌塘地块
发震构造
Zadoi earthquake
gCAP method
focal mechanism solution
Changthang block
seismogenic structure
