InSAR 3D Coseismic Surface Deformation Inversion: A Combination Method Considering Deformation Gradient

CHEN Mingkai; XU Guangyu; WANG Leyang

doi:10.13203/j.whugis20220284

Volume 48 Issue 8

Aug. 2023

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Geomatics and Information Science of Wuhan University > 2023 > 48(8): 1349-1358. > DOI: 10.13203/j.whugis20220284

CHEN Mingkai, XU Guangyu, WANG Leyang. InSAR 3D Coseismic Surface Deformation Inversion: A Combination Method Considering Deformation Gradient[J]. Geomatics and Information Science of Wuhan University, 2023, 48(8): 1349-1358. DOI: 10.13203/j.whugis20220284

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InSAR 3D Coseismic Surface Deformation Inversion: A Combination Method Considering Deformation Gradient

CHEN Mingkai^{1, 2, 3,},
XU Guangyu^{1, 2, 3, ,},
WANG Leyang^{1, 2, 3}

1.
Key Laboratory for Digital Land and Resources of Jiangxi Province, East China University of Technology, Nanchang 330013, China
2.
Key Laboratory of Mine Environmental Monitoring and Improving Around Poyang Lake of Ministry of Natural Resources, East China University of Technology, Nanchang 330013, China
3.
School of Surveying and Geoinformation Engineering, East China University of Technology, Nanchang 330013, China

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Received Date: May 11, 2022
Available Online: December 01, 2022
Published Date: August 04, 2023

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Abstract

Abstract

Objectives The coseismic surface three-dimensional (3D) deformation field is the most intuitive description of the surface deformation caused by earthquakes in real space. In the study of seismic deformation, the recovery of coseismic surface 3D deformation field is of great significance. In view of the shortcomings and defects of the current coseismic 3D deformation calculation method, a coseismic surface 3D deformation field joint calculation method considering deformation gradient is proposed.
Methods First, we use the deformation gradient information to decompose the deformation region obtained by interferometric synthetic aperture radar (InSAR) into disjoint subregions with approximately equal deformation gradient. Then, according to the number of observations in the sub-region, the weighted least square (WLS) method or InSAR 3D deformation calculation method based on stress-strain model (SM) and variance component estimation (VCE) are selected to obtain 3D deformation field of the coseismic surface.
Results Compared with the traditional WLS and SM-VCE methods, the results of simulation experiments and actual earthquake examples show that the deformation gradient information can effectively restore the surface 3D deformation of the earthquake rupture zone and obtain more complete and reliable 3D deformation field of the coseismic surface.
Conclusions This proposed method can avoid the defect that the traditional SM-VCE method cannot identify the differential deformation information on both sides of the fault in the cross-fault area, and make up for the lack of adjacent point information in the traditional WLS solution method.
- InSAR,
- 3D coseismic deformation field,
- deformation gradient,
- combined solution

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InSAR 3D Coseismic Surface Deformation Inversion: A Combination Method Considering Deformation Gradient

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