升降轨InSAR数据约束下的2007年阿里地震反演分析

doi:10.11947/j.AGCS.2015.20140349

测绘学报 ›› 2015, Vol. 44 ›› Issue (6): 649-654.doi: 10.11947/j.AGCS.2015.20140349

升降轨InSAR数据约束下的2007年阿里地震反演分析

温扬茂^1,2, 许才军¹, 刘洋¹, 冯万鹏³, 李志才⁴

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. 格拉斯哥大学地理与地球科学学院, 英国格拉斯哥 G12 8QQ;
4. 国家基础地理信息中心大地测量部, 北京 100048

收稿日期:2014-07-16 修回日期:2014-12-20 出版日期:2015-06-20 发布日期:2015-07-28
作者简介:温扬茂(1982—),男,博士,副教授,主要从事InSAR数据处理及其地球物理学解释的研究。E-mail: ymwen@sgg.whu.edu.cn
基金资助:
国家973计划(2013CB733304);国家自然科学基金(41204010;41274032;41274030;41404007;41431069);地震行业科研专项资金(201308009);中国博士后科学基金(2013M542062);中央高校基本科研业务费专项资金(2042014kf0055)

The 2007 Ali Earthquake Inversion from Ascending and Descending InSAR Observations

WEN Yangmao^1,2, XU Caijun¹, LIU Yang¹, FENG Wanpeng³, LI Zhicai⁴

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. School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK;
4. Department of Geodesy, National Geomatics Center of China, Beijing 100048, China

Received:2014-07-16 Revised:2014-12-20 Online:2015-06-20 Published:2015-07-28
Supported by:
The National Basic Research Program of China(973 Program) (No.2013CB733304);The National Natural Science Foundation of China (Nos.41204010;41274032;41274030;41404007;41431069);The Special Earthquake Industry Research Project (No.201308009);The China Postdoctoral Science Foundation (No.2013M542062);The Fundamental Research Funds for the Central Universities (No.2042014kf0055)

摘要/Abstract

摘要： 2007年5月5日,西藏阿里地区发生了M_w6.1级地震。本文采用Envisat卫星的升、降轨SAR数据获取地震的精确同震地表位移,然后基于弹性半空间位错模型,分别采用MPSO非线性和最小二乘线性反演算法确定了断层几何参数和滑动分布模型。结果表明,分布式滑动分布模型能较好地解释观测到的InSAR地表形变场。地震发震断层为走向158°、倾角43°的西南倾断层,主要的滑动量集中在7～12 km的深度,最大滑动量约0.3 m,位于9 km的深度。反演给出的地震矩为1.24×10¹⁸ Nm,与地震学结果相一致。

关键词: 阿里地震, InSAR, 滑动分布反演, 震源机制

Abstract: On 5th May, 2007, a M_w6.1 earthquake occurred in the Ali region, China. In this study, ascending and descending tracks of ASAR images collected by Envisat satellite are employed to derive the precise coseismic surface displacements, then nonlinear MPSO algorithm and linear least-square method with elastic half-space dislocation model are used to estimate the fault geometry and coseismic slip distribution. Our model suggests that the distributed slip mode can fit the observations very well. The earthquake fault is a normal fault with a strike of 158°, a dip of 43° and dipping to southwest. The slip mainly occurs within 7~12 km along the orientation, with a maximum slip of 0.3 m at a depth of 9 km. The determined geodetic moment is 1.24×10¹⁸ Nm, which is consistent with seismological results.

Key words: Ali earthquake, InSAR, slip distribution inversion, focal mechanism

中图分类号:

P225.1

温扬茂, 许才军, 刘洋, 冯万鹏, 李志才. 升降轨InSAR数据约束下的2007年阿里地震反演分析[J]. 测绘学报, 2015, 44(6): 649-654.

WEN Yangmao, XU Caijun, LIU Yang, FENG Wanpeng, LI Zhicai. The 2007 Ali Earthquake Inversion from Ascending and Descending InSAR Observations[J]. Acta Geodaetica et Cartographica Sinica, 2015, 44(6): 649-654.

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升降轨InSAR数据约束下的2007年阿里地震反演分析

The 2007 Ali Earthquake Inversion from Ascending and Descending InSAR Observations

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