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2016年11月25日新疆阿克陶6.7级地震序列震源机制特征分析
魏芸芸1, 李金1, 王琼1, 孙昭杰2
1.新疆维吾尔自治区地震局, 乌鲁木齐 830011;2.喀什基准台, 新疆喀什 844000
摘要:
本研究利用新疆区域数字地震台网的波形资料,采用CAP方法反演了2016年11月25日阿克陶6.7级地震的前震、主震及11次MS ≥ 3.6余震序列的最佳双力偶震源机制解,得到阿克陶6.7级地震最佳双力偶机制解:节面Ⅰ走向20°/倾角69°/滑动角-10°;节面Ⅱ走向114°/倾角81°/滑动角-159°,表明此次阿克陶6.7级地震为一次走滑型地震事件,结合震源区的地震地质构造及余震序列空间分布等已有研究成果,判定节面Ⅱ代表了主震的发震断层面。主震最大主压力轴方位为339°,与震源区附近历史中强震P轴近NW向的优势方位基本一致。其4.8级前震的震源机制解为走滑型,与主震震源机制解具有较高的一致性。11次余震中有6次为走滑型地震,3次为逆断型地震,1次正断型地震,1次混合型地震,且多数地震具有近NW向的P轴方位。此次6.7级地震序列的震源深度分布于6~16km之间,而大部分地震为9~13km,与本文计算得到的主震的震源深度10km相差不大。此外,初步分析了兴都库什-帕米尔地区强震活动与此次阿克陶6.7级地震的关系。
关键词:  阿克陶6.7级地震  震源机制解  CAP方法  兴都库什-帕米尔地区
DOI:
分类号:P315
基金项目:地震科技星火计划(XH17041Y)、新疆地震科学基金(201901)和国家重点研发计划课题(2018YFC1503606-06)共同资助
The Characteristics of the Focal Mechanisms of MS6.7 Earthquake Sequence on November 25,2016 in Aketao,Xinjiang
Wei Yunyun1, Li Jin1, Wang Qiong1, Sun Zhaojie2
1.Earthquake Agency of Xinjiang Uygur Autonomous Region, Urumqi 830011, China;2.Kashi Standard Seismic Station of Earthquake Agency of Xinjiang Uygur Autonomous Region, Kashi 844000, Xinjiang, China
Abstract:
Based on the broadband waveforms recorded by Xinjiang Digital Seismic Networks,we inversed the focal mechanism solutions of the Aketao MS6.7 main shock,foreshock and MS ≥ 3.6 aftershocks by using CAP method. The results shows that the focal mechanism of the MS6.7 strong earthquake had the nodal plane Ⅰ with strike 20°/dip 69°/rake -10° and the nodal plane Ⅱ with strike 114°/dip 81°/rake -159°. Combining with the seismo-tectonic background of the seismic area,nodal plane Ⅱ was identified to be the seismogenic fault plane of the main shock. The direction of P-axis for the main shock is 339°,which is close to the NW,preferred direction of the P-axis of historical earthquakes in this area. The focal mechanism solution of MS4.8 foreshock is in high consistency with main shock. About six aftershocks are strike-slip type earthquakes,three aftershocks are thrust type earthquakes,one aftershock is normal type earthquake,and one aftershock is hybrid type earthquake. The P-axis of most earthquakes in the sequence yields the NW direction. The focal depth of this MS6.7 earthquake sequence distributed at 6~16km,and most of the earthquakes occurred within the depth range at 9~13km,which is close to the focal depth of 10km of mainshock we calculated. Finally,we conducted a preliminary analysis on the relationship between the strong earthquakes in Hindu Kush Pamir region and this Aketao 6.7 earthquake.
Key words:  Aketao 6.7 earthquake  Focal mechanism  CAP method  Hindu Kush Pamir region