地震地质 ›› 2018, Vol. 40 ›› Issue (5): 1100-1114.DOI: 10.3969/j.issn.0253-4967.2018.05.010

• 研究论文 • 上一篇    下一篇

2016年新疆呼图壁6.2级地震发震构造

杨文1,2, 程佳3, 姚琪2, 崔仁胜4, 龙海云2, 韩颜颜2   

  1. 1 中国地震局地球物理研究所, 北京 100081;
    2 中国地震台网中心, 北京 100045;
    3 中国地震局地壳应力研究所, 北京 100085;
    4 中国地震局地震预测研究所, 北京 100036
  • 收稿日期:2017-11-16 修回日期:2018-07-26 出版日期:2018-10-20 发布日期:2018-11-29
  • 作者简介:杨文,男,1986年生,2011年于中国地震局地震预测研究所获固体地球物理专业硕士学位,中国地震局地球物理研究所固体地球物理专业在职博士,主要研究方向为数字地震学,电话:13426030043,E-mail:yangwen@seis.ac.cn。
  • 基金资助:
    国家自然科学基金(41404043,41504047)与中国地震台网中心青年基金(QNJJ201709)共同资助。

THE PRELIMINARY STUDY ON THE SEISMOGENIC STRUCTURE OF THE HUTUBI MS6.2 EARTHQUAKE

YANG Wen1,2, CHENG Jia3, YAO Qi2, CUI Ren-sheng4, LONG Hai-yun2, HAN Yan-yan2   

  1. 1 Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;
    2 China Earthquake Networks Center, Beijing 100045, China;
    3 Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;
    4 Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China
  • Received:2017-11-16 Revised:2018-07-26 Online:2018-10-20 Published:2018-11-29

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MS6.2地震及ML1.0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MS6.2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MW=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。

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

Abstract: Based on the phase report of Xinjiang Seismic Network, the Hutubi MS6.2 earthquake sequence ML ≥ 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 MS ≥ 3.8 were determined by the CAP method. Based on the above studies, the source depth, focal mechanism and aftershock distribution of the Hutubi MS6.2 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 MW 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.

Key words: 2016 Hutubi MS6.2 earthquake, seismogenic structure, double-difference algorithm, focal mechanism, Cut-and-Paste method

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