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联合地震位错模型和InSAR数据构建2017年九寨沟Mw6.5地震同震三维形变场

彭颖,  许才军,  刘洋

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彭颖, 许才军, 刘洋. 联合地震位错模型和InSAR数据构建2017年九寨沟Mw6.5地震同震三维形变场[J]. 武汉大学学报 ● 信息科学版. doi: 10.13203/j.whugis20200289
引用本文: 彭颖, 许才军, 刘洋. 联合地震位错模型和InSAR数据构建2017年九寨沟Mw6.5地震同震三维形变场[J]. 武汉大学学报 ● 信息科学版. doi: 10.13203/j.whugis20200289
shu
Peng Ying, Xu Caijun, Liu Yang. Deriving 3D Coseismic Deformation Field of 2017 Jiuzhaigou Earthquake Based on the Elastic Dislocation Model and InSAR Data[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200289
Citation: Peng Ying, Xu Caijun, Liu Yang. Deriving 3D Coseismic Deformation Field of 2017 Jiuzhaigou Earthquake Based on the Elastic Dislocation Model and InSAR Data[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200289
shu

联合地震位错模型和InSAR数据构建2017年九寨沟Mw6.5地震同震三维形变场

doi: 10.13203/j.whugis20200289

  • 1 武汉大学测绘学院,湖北 武汉, 430079;

  • 2 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 自然资源部地球物理大地测量重点实验室,湖北 武汉, 430079

基金项目: 

国家自然科学基金项目（41721003，41874011）；国家重点研发计划（2018YFC1503603）。

详细信息
    作者简介:

    彭颖,在读硕士,主要研究方向为InSAR高精度三维形变序列测量。Email:pngying@163.com

  • 中图分类号: P237;P315

Deriving 3D Coseismic Deformation Field of 2017 Jiuzhaigou Earthquake Based on the Elastic Dislocation Model and InSAR Data

  • 1 School of Geodesy and Geomatics, Whuhan University, Wuhan 430079, China;

  • 2 Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China;

  • 3 Key Laboratory of Geophysical Geodesy, Ministry of Natural Resources, Wuhan 430079, China

Funds: 

National Natural Science Foundation of China(41721003, 41874011)

  • 摘要: 本文利用Sentinel-1A卫星升、降轨影像，在地震位错模型约束下获取了2017年九寨沟Mw6.5地震的高质量三维形变场。首先，利用差分干涉测量技术提取九寨沟地震升、降轨InSAR（Interferometric Synthetic Aperture Radar，InSAR）同震形变场；然后，通过"两步法"反演获取该地震发震断层的几何参数和分布式滑动模型，以此为约束，采用方差分量估计算法联合解算九寨沟地震三维形变场。结果表明，九寨沟地震同震三维形变场以水平位移为主，垂向形变较弱；南北向形变呈拉张趋势，断层上盘向南、下盘向北滑动，最大位移分别为-19.81cm和14.38cm；东西向形变不对称性明显，断层上盘西北部向东水平运动，最大位移为18.37cm，下盘东南部向西运动，最大位移不足8cm。南北、东西向形变与6个GNSS（Global Navigation SatelliteSystem，GNSS）台站观测数据进行比较，两者一致性较好且均方根误差较小，分别为1.44cm和1.77cm，表明联合升、降轨InSAR观测和地震位错模型约束构建同震三维形变场方法具有较高可行性，显著降低了大地测量数据不足、InSAR观测对南北向形变不敏感等问题的影响，为地震形变监测提供了更为广泛的应用前景。
    Abstract: In this study, we construct high-quality three-dimensional(3D) coseismic deformation field of 2017 Jiuzhaigou earthquake using ascending and descending SAR(Synthetic Aperture Radar, SAR) data from sentinel-1A satellite with constraint of the elastic dislocation model. Firstly, using differential interferometry method to generate LOS(Line of Sight, LOS) coseismic deformation field with SAR images. Then, a two-step inversion algorithm is used to subdivide the fault plane, and obtain the geometric parameters and the optimal fault slip distribution. With constraint of this fault model, we take the variance component estimation approach to reconstruct 3D coseismic deformation field based on InSAR(Interferometric Synthetic Aperture Radar, InSAR) measurements. The results show that the coseismic deformation field is dominated by horizontal displacement. In the North-South(N) direction, the maximum displacement of the hanging wall is -19.81cm and 14.38cm in the footwall. In the East-West(E) direction, the maximum displacement of the hanging wall is 18.37cm for the northwestern, while that of the footwall is -7.84cm for the Southeastern. In the Vertical(U) direction, there is a little uplift in the northern of the fault and the maximum is about 3cm. Finally, the derived North-South and EastWest displacements were also compared with the GNSS(Global Navigation Satellite System, GNSS) investigations, indicating that combing InSAR measurements and elastic dislocation model to reconstruction 3D seismic deformation field is feasible and effective, which overcomes the problem of insufficient geodetic data and offers extensive future usage for measuring earthquake deformation.
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出版历程
  • 收稿日期:  2021-06-15
  • 网络出版日期:  2022-03-12

联合地震位错模型和InSAR数据构建2017年九寨沟Mw6.5地震同震三维形变场

doi: 10.13203/j.whugis20200289
  • 1 武汉大学测绘学院,湖北 武汉, 430079;
  • 2 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 自然资源部地球物理大地测量重点实验室,湖北 武汉, 430079
    • 基金项目:

    国家自然科学基金项目（41721003，41874011）；国家重点研发计划（2018YFC1503603）。

    作者简介:

    彭颖,在读硕士,主要研究方向为InSAR高精度三维形变序列测量。Email:pngying@163.com

  • 收稿日期: 2021-06-15
  • 网络出版日期: 2022-03-12

  • 中图分类号: P237;P315

摘要: 本文利用Sentinel-1A卫星升、降轨影像，在地震位错模型约束下获取了2017年九寨沟Mw6.5地震的高质量三维形变场。首先，利用差分干涉测量技术提取九寨沟地震升、降轨InSAR（Interferometric Synthetic Aperture Radar，InSAR）同震形变场；然后，通过"两步法"反演获取该地震发震断层的几何参数和分布式滑动模型，以此为约束，采用方差分量估计算法联合解算九寨沟地震三维形变场。结果表明，九寨沟地震同震三维形变场以水平位移为主，垂向形变较弱；南北向形变呈拉张趋势，断层上盘向南、下盘向北滑动，最大位移分别为-19.81cm和14.38cm；东西向形变不对称性明显，断层上盘西北部向东水平运动，最大位移为18.37cm，下盘东南部向西运动，最大位移不足8cm。南北、东西向形变与6个GNSS（Global Navigation SatelliteSystem，GNSS）台站观测数据进行比较，两者一致性较好且均方根误差较小，分别为1.44cm和1.77cm，表明联合升、降轨InSAR观测和地震位错模型约束构建同震三维形变场方法具有较高可行性，显著降低了大地测量数据不足、InSAR观测对南北向形变不敏感等问题的影响，为地震形变监测提供了更为广泛的应用前景。

English Abstract

彭颖, 许才军, 刘洋. 联合地震位错模型和InSAR数据构建2017年九寨沟Mw6.5地震同震三维形变场[J]. 武汉大学学报 ● 信息科学版. doi: 10.13203/j.whugis20200289
引用本文: 彭颖, 许才军, 刘洋. 联合地震位错模型和InSAR数据构建2017年九寨沟Mw6.5地震同震三维形变场[J]. 武汉大学学报 ● 信息科学版. doi: 10.13203/j.whugis20200289
shu
Peng Ying, Xu Caijun, Liu Yang. Deriving 3D Coseismic Deformation Field of 2017 Jiuzhaigou Earthquake Based on the Elastic Dislocation Model and InSAR Data[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200289
Citation: Peng Ying, Xu Caijun, Liu Yang. Deriving 3D Coseismic Deformation Field of 2017 Jiuzhaigou Earthquake Based on the Elastic Dislocation Model and InSAR Data[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200289
shu

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