| 2018年新疆伽师MS5.5地震的发震构造初探 |
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| 引用本文： | 金花,冉慧敏,赵石柱,闫新义.2018年新疆伽师MS5.5地震的发震构造初探[J].西北地震学报,2021,43(2):316-321. |
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| 作者姓名： | 金花 冉慧敏 赵石柱 闫新义 |
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| 作者单位： | 新疆维吾尔自治区地震局, 新疆 乌鲁木齐 830011 |
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| 基金项目： | 地震科技星火计划项目（XH18055）；中国地震局三结合项目（3JH-20202023） |
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| 摘 要： | 运用CAP方法反演2018年9月4日新疆伽师MS5.5地震及MS≥3.0余震的震源机制解,计算得出伽师MS5.5地震的震源机制解为:节面Ⅰ:走向48°,倾角83°,滑动角3°;节面Ⅱ:走向318°,倾角87°,滑动角173°;主压应力P轴方位角为3°,倾角为3°,主张应力T轴方位角273°,倾角为7°;矩震级为MW5.3。使用双差定位法对主震及余震共计129个MS≥1.5地震进行重新定位,并对震源机制解和重定位结果进行综合分析,发现此次重定位地震结果与CAP方法反演结果的展布方向一致,地震集中分布在NEE向,因此认为节面I是此次地震的主破裂面;重定位后NS、EW和UD方向的平均相对误差分别为0.25、0.23及0.09 km,平均走时残差为0.026 s,震源深度集中分布在5~15 km。此次地震及其余震附近地表无明显的断层出露,所以初步判定2018年新疆伽师MS5.5地震可能受控于柯坪断裂带附近的隐伏断裂。
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| 关 键 词： | 伽师MS5.5地震 地震序列 震源机制解 应力场 双差定位 |
| 收稿时间： | 2020/4/10 0:00:00 |
A Preliminary Study on the Seismogenic Structure of the 2018 Jiashi MS5.5 Earthquake in Xinjiang |
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| JIN Hu,RAN Huimei,ZHAO Shizhu,YAN Xinyi.A Preliminary Study on the Seismogenic Structure of the 2018 Jiashi MS5.5 Earthquake in Xinjiang[J].Northwestern Seismological Journal,2021,43(2):316-321. |
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| Authors: | JIN Hu RAN Huimei ZHAO Shizhu YAN Xinyi |
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| Institution: | Xinjiang Earthquake Agency, Urumqi 830011, Xinjiang, China |
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| Abstract: | On September 4,2018,an MS5.5 earthquake occurred in Jiashi,Xinjiang.In this paper,the CAP method was applied to calculate the focal mechanism solutions of the MS5.5 mainshock and MS≥3.0 aftershocks,and the result showed that the strike,dip,and rake angles of nodal planeⅠandⅡare 48°,83°,3°,and 318°,87°,173°,respectively.The azimuth and plunge of the principal compressive stress P axis are 3°and 3°,respectively,and the azimuth and plunge of the principal tensile stress T axis are 273°and 7°,respectively.The moment magnitude of the mainshock is MW5.3.The double-difference location method was used to relocate 129 earthquakes with MS≥1.5,and the focal mechanism solutions and relocation results were comprehensively analyzed.It is found that the earthquake distribution obtained from relocation result is consistent with that from the inversion result of CAP method,and the earthquakes are concentrated in the NEE direction.Therefore,it is considered that nodal plane I is the main rupture plane of this earthquake.After relocation,the average relative errors of NS,EW,and UD directions are 0.25,0.23,and 0.09 km,respectively.The average travel-time residual is 0.026 s,and the focal depth is concentrated in 5-15 km.It is preliminarily determined that the 2018 Jiashi MS5.5 earthquake may be controlled by the hidden fault near the Keping fault zone. |
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| Keywords: | Jiashi MS5 5 earthquake seismic sequence focal mechanism solution stress field double-difference location method |
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