温少妍^1,2,,
单新建^1,,,
张国宏¹,
张迎峰³,
屈春燕¹,
赵德政¹,
李彦川¹
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

基金项目: 国家自然科学基金（41461164002，41631073）和所长基金（IGCEA1613）联合资助


详细信息

作者简介: 温少妍, 女, 1985年生, 工程师, 中国地震局地质研究所在读博士, 主要从事InSAR技术及其在地震科学中的应用研究.E-mail:wenshaoyan999@163.com

通讯作者: 单新建, 男, 1966年生, 研究员, 主要从事地壳形变观测与动力学研究.E-mail:xjshan@163.com

中图分类号: P315

收稿日期:2017-04-05
修回日期:2018-05-11
上线日期:2018-06-05

Rupture history of the 2008 M_W6.3 Da Qaidam earthquake by joint inversion of teleseismic data and InSAR measurements

WEN ShaoYan^1,2,,
SHAN XinJian^1,,,
ZHANG GuoHong¹,
ZHANG YingFeng³,
QU ChunYan¹,
ZHAO DeZheng¹,
LI YanChuan¹
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


More Information

Corresponding author: SHAN XinJian,E-mail:xjshan@163.com

MSC: P315

--> Received Date: 05 April 2017
Revised Date: 11 May 2018
Available Online: 05 June 2018


摘要
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M_W6.3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M_W6.37.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.
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

Abstract:A seismic source model for the 2008 M_W6.3 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 M_W6.37. Based on a comprehensive analysis of the static slip distribution and the kinematic rupture process of the 2008 M_W6.3 Da Qaidam earthquake, we propose that the southwest dipping Da Qaidam-Jun Ul Shan fault could be the seismogenic fault.
Key words:Da Qaidam earthquake/
InSAR deformation field/
Teleseismicwaves/
Rupture history/
Joint inversion



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