| 基于InSAR和远场地震波联合反演2008年MW6.3大柴旦地震震源破裂过程 |
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| 引用本文： | 温少妍,单新建,张国宏,张迎峰,屈春燕,赵德政,李彦川.基于InSAR和远场地震波联合反演2008年MW6.3大柴旦地震震源破裂过程[J].地球物理学报,2018,61(6):2301-2309. |
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| 作者姓名： | 温少妍 单新建 张国宏 张迎峰 屈春燕 赵德政 李彦川 |
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| 作者单位： | 1. 中国地震局地质研究所地震动力学国家重点实验室, 北京 100029;2. 新疆维吾尔自治区地震局, 乌鲁木齐 830011;3. 中国石油大学(华东), 青岛 266555 |
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| 基金项目： | 国家自然科学基金（41461164002，41631073）和所长基金（IGCEA1613）联合资助. |
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| 摘 要： | 利用InSAR同震形变升、降轨数据和远场地震波数据，基于均方根最小与标量地震矩最小双重约束下的模拟退火方法，联合反演2008年11月10日大柴旦MW6.3地震震源破裂过程.结果表明，2008年大柴旦地震震源破裂过程整体表现为沿倾向方向从深部破裂起始点处向上往地表传播，且破裂未到达地表；在前7 s内，滑动沿西北和东南两个方向传播，7 s后主要沿东南方向传播，破裂过程时间持续约为11 s，同震滑动分布主要集中在地下10~20 km范围内，最大滑动量达-0.71 m；反演结果揭示本次地震为西南倾高角度兼具微量走滑分量的逆冲破裂事件，反演矩张量为3.96×1018N·m，矩震级约MW6.37.通过大柴旦地震发震断层和破裂机制综合分析，初步判断发震断层为西南倾向的大柴旦—宗务隆山断裂.
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| 关 键 词： | 大柴旦地震 InSAR形变场 远场地震波 震源破裂过程 联合反演 |
| 收稿时间： | 2017-04-05 |
Rupture history of the 2008 MW6.3 Da Qaidam earthquake by joint inversion of teleseismic data and InSAR measurements |
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| WEN ShaoYan,SHAN XinJian,ZHANG GuoHong,ZHANG YingFeng,QU ChunYan,ZHAO DeZheng,LI YanChuan.Rupture history of the 2008 MW6.3 Da Qaidam earthquake by joint inversion of teleseismic data and InSAR measurements[J].Chinese Journal of Geophysics,2018,61(6):2301-2309. |
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| Authors: | WEN ShaoYan SHAN XinJian ZHANG GuoHong ZHANG YingFeng QU ChunYan ZHAO DeZheng LI YanChuan |
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| Institution: | 1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2. Earthquake Administration of XinJiang Uygur Autonomous Region, Vrümqi 830011, China;3. China University of Petroleum, Qingdao 266555, China |
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| Abstract: | A seismic source model for the 2008 MW6.3 Da Qaidam earthquake, northern Tibetan Plateau, was constructed by joint inversion of Interferometric Synthetic Aperture Radar (InSAR) images and teleseismic data sets, suggesting that the earthquake was a thrust-faulting dominated event on a steeply dipping plane. As for the inversion procedure, we choose simulated annealing based on the simultaneous minimization of the normalized root mean square misfit of the two data sets and of the total seismic moment, which is a nonlinear inversion procedure and can fully solve problems without dependency on a starting model. The modeled rupture evolution showed updip propagation from the hypocenter, whereas unruptured to the surface. Most seismic moment was released within 11 s, with a bilateral rupture propagation northwest wards and southeast wards at the first 7 s, and continued southeastwards for the remaining 4 s. The major slip concentrated around a relatively shallow depth of 10-20 km, with maximum slip of 0.71 m. The inferred slip distribution and the resulting seismic moment (3.96×1018N·m) suggest a magnitude of MW6.37. Based on a comprehensive analysis of the static slip distribution and the kinematic rupture process of the 2008 MW6.3 Da Qaidam earthquake, we propose that the southwest dipping Da Qaidam-Jun Ul Shan fault could be the seismogenic fault. |
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| Keywords: | Da Qaidam earthquake InSAR deformation field Teleseismicwaves Rupture history Joint inversion |
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