2008年大柴旦Mw 6.3级地震的InSAR同震形变观测及断层参数反演

刘洋; 许才军; 温扬茂; 何平

doi:10.11947/j.AGCS.2015.20140628

测绘学报 >

2015 , Vol. 44 >Issue 11: 1202 - 1209

DOI: https://doi.org/10.11947/j.AGCS.2015.20140628

大地测量学与导航

2008年大柴旦M_w 6.3级地震的InSAR同震形变观测及断层参数反演

刘洋 ,
许才军 ,
温扬茂 ,
何平

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1. 武汉大学测绘学院, 湖北武汉 430079;
2. 武汉大学地球空间环境与大地测量教育部重点实验室, 湖北武汉 430079;
3. 地球空间信息技术协同创新中心, 湖北武汉 430079;
4. 中国地质大学地球物理与空间信息学院地球内部多尺度成像湖北省重点实验室, 湖北武汉 430074

刘洋(1984-),男,博士,讲师,研究方向为InSAR数据处理与地球物理解释。E-mail:yang.liu@sgg.whu.edu.cn

收稿日期: 2014-11-28

修回日期: 2015-05-27

网络出版日期: 2015-11-25

基金资助

国家973计划(2013CB733304);国家863计划(2013AA122501);国家自然科学基金(41404007;41431069;41204010);中国博士后科学基金(2013M542062);中央高校基本科研业务费专项(2042014kf0055);国家测绘地理信息局基础研究基金(13-02-01)

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The InSAR Coseismic Deformation Observation and Fault Parameter Inversion of the 2008 Dachaidan M_w6.3 Earthquake

LIU Yang ,
XU Caijun ,
WEN Yangmao ,
HE Ping

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1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;
2. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China;
3. Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China;
4. Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaAbstract

Received date: 2014-11-28

Revised date: 2015-05-27

Online published: 2015-11-25

Supported by

The National Basic Research Program of China(973 Program)(No.2013CB733304) The National High-tech Research and Development Program of China(863 Program)(No.2013AA122501) The National Natural Science Foundation of China(Nos.414040074143106941204010) The China Postdoctoral Science Foundation(No.2013M542062) The Fundamental Research Funds for the Central Universities(No.2042014kf0055);Surveying and Mapping Basic Research Program of National Administration of Surveying, Mapping and Geoinformation(No.13-02-01)

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摘要

2008年11月10日,青海省大柴旦地区发生了M_w6.3级地震。本文利用EnviSat卫星升降轨SAR数据和差分干涉测量技术提取了同震形变场,基于均匀位错模型反演确定了地震断层参数,然后利用格网迭代搜索法确定了较优断层倾角,同时基于非均匀位错模型获得了精细滑动分布。结果表明,地震使得上盘区域沿降轨、升轨视线向分别产生最大约8.5cm、10cm的抬升;较优断层倾角为47.9°地震滑动未延伸至地表,主要发生在地下8.2~23.7km深度范围内,最大和平均滑动量为0.5m和0.19m,平均滑动角为104.9°。反演的地震矩为3.74×10¹⁸N·m,矩震级为M_w6.35。

关键词： 大柴旦M_w6.3级地震; InSAR; 同震形变; 反演; 滑动分布

本文引用格式

刘洋 , 许才军 , 温扬茂 , 何平 . 2008年大柴旦M_w 6.3级地震的InSAR同震形变观测及断层参数反演[J]. 测绘学报, 2015 , 44(11) : 1202 -1209 . DOI: 10.11947/j.AGCS.2015.20140628

Abstract

On November 10, 2008, an M_w6.3 earthquake struck the Dachaidan region of Qinghai Province. The ascending and descending synthetic aperture radar(SAR) data from EnviSat satellite and the differential interferometric SAR(DInSAR) technology are used to extract the coseismic deformation field. The uniform dislocation model is used to determine the fault parameters, the grid iteration method is then used to find the optimal dip angle, and the non-uniform dislocation model is used to obtain the detailed slip distribution simultaneously. The results show that the earthquake uplifts the hanging wall up to~8.5cm and~10cm along the line of sight of the descending and ascending tracks, respectively. The optimal dip angle is 47.9°. The coseismic slip doesn't rupture to the earth surface, and mainly occurs at a depth range from 8.2km to 23.7km, with the maximum and average slip of 0.5m and 0.19m, respectively. The average rake angle is 104.9°. The inverted earthquake moment is 3.74×10¹⁸ N·m, and the moment magnitude M_w is 6.35.

Key words： the DachaidanM_w6.3 earthquake; InSAR; coseismic deformation; inversion; slip distribution

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