| 2017年精河MS6.6地震的断层参数和破裂过程 |
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| 引用本文： | 王平川,张勇,冯万鹏.2017年精河MS6.6地震的断层参数和破裂过程[J].地震学报,2021,43(2):137-151. |
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| 作者姓名： | 王平川 张勇 冯万鹏 |
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| 作者单位： | 中国北京 100871 北京大学地球与空间科学学院;中国广州 510275 中山大学地球科学与工程学院;中国广州 510275 中山大学广东省地球动力作用与地质灾害重点实验室;中国广东珠海 519082 南方海洋科学与工程广东省实验室(珠海) |
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| 基金项目： | 国家自然科学基金（41822401）和国家重点研发计划（2018YFC1503705）联合资助 |
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| 摘 要： | 利用远震资料、近场强震资料和合成孔径雷达干涉同震形变资料确定了2017年8月9日精河MS6.6地震的断层面参数及震源破裂细节。为得到可靠的断层几何参数，发展了一套基于InSAR数据滑动分布反演的三维格点搜索流程，对本次地震断层面的走向、倾角和震源深度进行了格点搜索。结果显示，地震断层面走向为95°，倾角为47°，震源深度为14 km。基于搜索得到的断层模型进行破裂过程联合反演的结果显示:精河MS6.6地震为一次单侧破裂事件，最大滑动量约为0.8 m，滑动区域集中在断层面上震源以西5—15 km，沿倾向15—25 km，破裂主要发生在10 km深度以下区域。断层面上的平均滑动角为106°。整个破裂过程释放的标量地震矩为3.6×1018 N·m，对应矩震级为MW6.3。破裂过程持续约9 s，期间的破裂速度约为2.1—2.6 km/s。由于地震破裂主要集中在10 km以下，未来可能需要关注该区域0—10 km发生潜在地震的可能性。
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| 关 键 词： | 2017年精河MS6.6地震 断层几何参数 震源破裂过程 联合反演 |
| 收稿时间： | 2020-04-08 |
Fault parameters and rupture process of the Jinghe MS6.6 earthquake in 2017 |
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| Wang Pingchuan,Zhang Yong,Feng Wanpeng.Fault parameters and rupture process of the Jinghe MS6.6 earthquake in 2017[J].Acta Seismologica Sinica,2021,43(2):137-151. |
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| Authors: | Wang Pingchuan Zhang Yong Feng Wanpeng |
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| Affiliation: | 1.School of Earth and Space Sciences，Peking University，Beijing 100871，China2.School of Earth Science and Engineering，Sun Yat-Sen University，Guangzhou 510275，China3.Guangdong Provincial Key Laboratory of Geodynamics and Geohazards，Sun Yat-Sen University，Guangzhou 510275，China4.Southern Marine Science and Engineering Guangdong Laboratory （Zhuhai），Guangdong Zhuhai 519082，China |
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| Abstract: | We estimated the fault geometrical parameters and source rupture details of the Jinghe MS6.6 earthquake on August 9, 2017 by inverting teleseismic, near-field strong-motion and InSAR data. In order to determine the fault geometrical parameters, we conducted a 3-D grid search process by performing geodetic slip inversions with InSAR data, and found theoptimal values of fault strike, dip and hypocentral depth to be 95°, 47° and 14 km, respectively. Joint inversion of rupture process based on the searched fault model shows a unilateral rupture model with a maximum slip of 0.8 m. Slips mainly concentrate between 5?15 km to the west of the hypocenter, and 15?25 km along down-dip direction. Most ruptures occurred beneath 10 km depth. The average rake angle is about 106°, suggesting a purely thrust event of the earthquake. The obtained seismic scalar moment is 3.6×1018 N·m, equivalent to a magnitude of MW6.3. The rupture duration is about 9 s, in which the rupture propagated with the velocity of 2.1?2.6 km/s. Attention to occurrence of earthquakes above 10 km depth in this area may be required, as most ruptures of this earthquake occurred beneath 10 km depth. |
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