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地震 ›› 2014, Vol. 34 ›› Issue (4): 110-117.

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2013年7月22日岷县漳县6.6级地震序列震源机制解及其特征分析

张辉1,2, 张浪平3, 冯建刚1,2   

  1. 1.中国地震局兰州地震研究所,甘肃兰州730000;
    2.兰州地球物理国家野外科学观测研究站,甘肃兰州730000;
    3.中国地震局地震预测研究所,北京100036
  • 收稿日期:2014-03-20 修回日期:2014-05-16 发布日期:2020-09-11
  • 作者简介:张辉(1978-),男,山东邹平人,副研究员,主要从事地震学及地震综合预测等研究。
  • 基金资助:
    中国地震局地震科技星火计划(XH14049)、国家自然科学基金(41 304048.41174059)和和中国地震局定向跟踪任务(2014020112)共同资助

Focal Mechanism Solutions and Characteristics of the July 22,2013 Minxian-Zhangxian Ms6.6 Earthquake Sequence

ZHANG Hui1,2, ZHANG Lang ping3, FENG Jian-gang1,2   

  1. 1. Lanzhou Institute of Seismology, CEA, Lanzhou 7 30000, China;
    2. Lanzhou National Observatory of Geophysics, Lanzhou 730000, China;
    3. Institute of Earthquake Science, CEA, Beijing 100036, China
  • Received:2014-03-20 Revised:2014-05-16 Published:2020-09-11

摘要: 针对2013年7月22日甘肃岷县漳县发生的Ms6.6地震序列,采用CAP(Cut and Paste)方法反演了岷县漳县6.6级地震及部分强余震的震源机制解。结果显示,6.6级主震最佳双力偶解节面I走向189°,倾角51°,滑动角142°;节面II参数走向305°,倾角61°和滑动角46°,主震为逆冲兼走滑型,矩心震源深度均为7km;8次Ms≥3.0余震震源机制解向NE倾的节面II的优势倾角约为52°,表现出逆冲分量大的特性。结合震区的活动构造、余震及烈度分布,判定节面II代表了相应地震的发震断层面,地震序列震源机制的特性反映了与临潭一宕昌断裂带相似的活动特征,分析认为,岷县漳县6.6级地震的发生与临潭-宕昌断裂的活动可能存在一定的相关性。

关键词: 震源机制, CAP方法, 岷县漳县6.6级地震, 临潭—宕昌断裂

Abstract: For the Minxian-Zhangxian Ms6. 6 earthquake sequence of July 22, 2013, we invert focal mechanism solutions of the mainshock event and some strong aftershocks in the sequence using the CAP (Cut and Paste)met hod and broadband waveforms recorded by the Tenth five-year digital seismic network. The result shows that the best double solution of the Ms6. 6 mainshock is 189° ,51° and 142° for strike, dip and rake angles respectively, the other nodal plane is 305°, 61° and 46°; the character of the mainshock shows thrust with a small strike-slip component and the focal depth of the mainshock is 7 km. The advantage angel of the nodal plane II which is in the NE direction of the focal mechanism solutions of 8 aftershock events is about 52°,which shows the characteristics of large thrust components. The nodal plane II has been identified to be representative of the seismogenic fault plane of the event in consideration of the local active geologic structure, the distributions of the aftershocks and the seismic intensities. The characteristics of the focal mechanism of earthquake sequence are similar with the Lintan- Tanchang fault. In concusion, the occurrence of the Minxian- Zhangxian Mg6. 6 earthquake may correlated with activities of the Lintan- Tanchang fault.

Key words: Focal mechanism, Minxian-Zhangxian Ms6.6 earthquake, Cut and Paste method, Lintan-Tanchangfault

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