2016年新疆呼图壁6.2级地震发震构造

doi:10.3969/j.issn.0253-4967.2018.05.010

摘要/Abstract

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。

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 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.

Key words: 2016 Hutubi M_S6.2 earthquake, seismogenic structure, double-difference algorithm, focal mechanism, Cut-and-Paste method

中图分类号:

P315.2

杨文, 程佳, 姚琪, 崔仁胜, 龙海云, 韩颜颜. 2016年新疆呼图壁6.2级地震发震构造[J]. 地震地质, 2018, 40(5): 1100-1114.

YANG Wen, CHENG Jia, YAO Qi, CUI Ren-sheng, LONG Hai-yun, HAN Yan-yan. THE PRELIMINARY STUDY ON THE SEISMOGENIC STRUCTURE OF THE HUTUBI M_S6.2 EARTHQUAKE[J]. SEISMOLOGY AND GEOLOGY, 2018, 40(5): 1100-1114.

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