摘要
文中利用新疆地震台网的震相报告,采用双差定位方法重新定位2016年12月8日新疆呼图壁M_S6.2地震及M_L1.0以上地震的震源位置,结果显示,余震沿NE和NW 2个方向展布,深度主要分布在5~15km范围内。同时利用新疆区域数字地震台网波形记录,采用CAP方法反演了呼图壁M_S6.2主震和部分余震的震源机制和震源深度。基于上述研究,综合分析了呼图壁6.2级地震的震源深度、震源机制和余震分布特征,探讨其发震构造。结果显示,呼图壁6.2级地震的最佳双力偶机制解节面Ⅰ走向144°、倾角26°、滑动角118°,节面Ⅱ走向293°、倾角67°、滑动角77°,矩震级M_W=5.9,矩心深度为15.2km,表明本次地震为1次逆冲型的地震事件。余震震源机制解大部分显示为逆冲型,与主震相似。推测本次地震的可能发震断裂为霍尔果斯-玛纳斯-吐谷鲁断裂。
Based on the phase report of Xinjiang Seismic Network,the Hutubi M S6.2 earthquake sequence M L≥1.0 was relocated by the HypoDD method.The results show that the aftershocks were distributed along NE and NW direction.The aftershocks were in the depths of 5~15km.In addition,by using the digital waveforms of Xinjiang Seismic Network,the best double-couple focal mechanism of the main shock and some aftershocks of M S≥3.8 were determined by the CAP method.Based on the above studies,the source depth,focal mechanism and aftershock distribution of the Hutubi M S6.2 earthquake were analyzed and the seismogenic structure was discussed.The nodal plane parameters of the best double-couple focal mechanism are strike 144°,dip 26°,rake 118°,and strike 293°,dip 67°,rake 77°,respectively.The moment magnitude M W is about 5.9,with centroid depth of 15.2km.These show that the main shock was a thrust type.Most focal mechanism solutions of the aftershocks were shown as a thrust type,which are similar to the main shock.It is speculated that the possible seismogenic fault of this earthquake is the Huorgosi-Manas-Tugulu Fault.
作者
杨文
程佳
姚琪
崔仁胜
龙海云
韩颜颜
YANG Wen;CHENG Jia;YAO Qi;CUI Ren-sheng;LONG Hai-yun;HAN Yan-yan(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;China Earthquake Networks Center,Beijing 100045,China;Institute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China;Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China)
出处
《地震地质》
EI
CSCD
北大核心
2018年第5期1100-1114,共15页
Seismology and Geology
基金
国家自然科学基金(41404043
41504047)
中国地震台网中心青年基金(QNJJ201709)共同资助
关键词
2016年呼图壁6.2级地震
发震构造
双差定位
震源机制
CAP法
2016 Hutubi M S6.2 earthquake
seismogenic structure
double-difference algorithm
focal mechanism
Cut-and-Paste method