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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

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

doi: 10.13203/j.whugis20200289
Funds:

National Natural Science Foundation of China(41721003, 41874011)

  • Received Date: 2021-06-15
    Available Online: 2022-03-12
  • 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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Deriving 3D Coseismic Deformation Field of 2017 Jiuzhaigou Earthquake Based on the Elastic Dislocation Model and InSAR Data

doi: 10.13203/j.whugis20200289
Funds:

National Natural Science Foundation of China(41721003, 41874011)

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.

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
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