通过InSAR与GPS数据融合获取汶川地震同震三维形变场

doi:10.3969/j.issn.0253-4967.2015.17

地震地质 ›› 2015, Vol. 37 ›› Issue (1): 222-231.DOI: 10.3969/j.issn.0253-4967.2015.17

通过InSAR与GPS数据融合获取汶川地震同震三维形变场

宋小刚¹, 申星^1,2, 姜宇², 万剑华², 单新建¹, 屈春燕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 中国石油大学(华东), 地球科学与技术学院, 青岛 266580

收稿日期:2013-04-07 修回日期:2014-12-10 发布日期:2015-05-15
通讯作者: 申星,男,在读硕士研究生,E-mail:shenxing_cumt@126.com
作者简介:宋小刚,男,1979年生,副研究员,主要从事雷达干涉测量技术(InSAR),电话:010-62009095,E-mail:sxghohai@163.com。
基金资助:
中国地震局地质研究所基本科研业务专项(IGCEA1010)和国家自然科学基金(41111140386)共同资助

COSEISMIC 3D DEFORMATION FIELD ACQUISITION OF THE WENCHUAN EARTHQUAKE BASED ON INSAR AND GPS DATA

SONG Xiao-gang¹, SHEN Xing^1,2, JIANG Yu², WAN Jian-hua², SHAN Xin-jian¹, QU Chun-yan¹

1 State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2 School of Geosciences, China University of Petroleum(East China), Qingdao 266580, China

Received:2013-04-07 Revised:2014-12-10 Published:2015-05-15

摘要/Abstract

摘要：

针对InSAR与GPS 两类独立的观测数据, 利用广义测量平差理论中方差分量估计法, 合理分配权重, 有效地融合了这两类观测数据, 从而估算出了地表在三维方向上的形变场。以四川汶川地震为例, 利用InSAR干涉测量结果和一定数量的GPS观测值, 通过该方法获取了地震断层两侧高相干区域上三维形变场, 清晰地显示了汶川地震的逆冲和右旋走滑分量的位置分布整体特征。结果表明, 在EW、SN和UD方向上地表形变量与GPS结果能够很好地吻合, 融合结果在三维方向上的均方根误差均不超过5cm, 证明了该方法能够得到精度较高的地震同震三维形变场, 也揭示了利用方差分量估计法对相互独立数据之间有效融合的可行性。

关键词: 汶川地震, 三维形变, 方差分量估计, InSAR, GPS

Abstract:

The variance component estimation method (VCEM) in generalized surveying adjustment theory, which realizes optimal weights allocation for different data sources, is applied to jointly invert two independent datasets, InSAR and GPS, for 3-D deformation field acquisition in this paper. Illustrated by the case of the Wenchuan earthquake, 3-D deformation field in high coherent area near the fault is achieved by using this method, which shows clearly a whole picture for the locations of right-lateral and thrust components movements generated by the earthquake. The 3-D deformation results are quantitatively consistent with GPS observations with RMS errors less than 5cm in 3-D directions, which demonstrates the feasibility to acquire precise 3-D deformation field by employing VCEM to fuse independent deformation datasets.

Key words: Wenchuan earthquake, 3-D deformation field, variance component estimation, InSAR, GPS

中图分类号:

P315.72⁺5

宋小刚, 申星, 姜宇, 万剑华, 单新建, 屈春燕. 通过InSAR与GPS数据融合获取汶川地震同震三维形变场[J]. 地震地质, 2015, 37(1): 222-231.

SONG Xiao-gang, SHEN Xing, JIANG Yu, WAN Jian-hua, SHAN Xin-jian, QU Chun-yan. COSEISMIC 3D DEFORMATION FIELD ACQUISITION OF THE WENCHUAN EARTHQUAKE BASED ON INSAR AND GPS DATA[J]. SEISMOLOGY AND GEOLOGY, 2015, 37(1): 222-231.

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通过InSAR与GPS数据融合获取汶川地震同震三维形变场

COSEISMIC 3D DEFORMATION FIELD ACQUISITION OF THE WENCHUAN EARTHQUAKE BASED ON INSAR AND GPS DATA

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