A joint InSAR-GNSS workfow for correction and selection of interferograms to estimate high-resolution interseismic deformations

作     者：Hongzhi Liu Lei Xie Guoqiang Zhao Eslam Ali Wenbin Xu 

作者机构：School of Geoscience and Info-PhysicsCentral South UniversityChangsha 410083China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationChangsha 410083China Public Works DepartmentGeomatics DivisionFaculty of EngineeringCairo UniversityGiza Governorate 12613Egypt 

出 版 物：《Satellite Navigation》 (卫星导航（英文）)

年 卷 期：2023年第4卷第1期

页      面：183-195,I0006页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：the National Natural Science Foundation of China(42174023) Frontier cross research project of Central South University(Grant number:2023QYJC006) 

主　　题：Interferometric synthetic aperture radar GNSS Joint workfow Interseismic deformation Haiyuan fault zone 

摘      要：Knowledge of the spatial distribution of interseismic deformations is essential to better understand earthquake *** existing methods for improving the reliability of the obtained deformations often rely on visual inspection and prior model corrections that are time-consuming,labor-intensive,and do not consider the spatial distribution of interseismic *** Synthetic Aperture Radar(InSAR)data provides wide-scale coverage for interseismic deformation monitoring over a wide ***,the interseismic signal featured as millimeter-scale and long-wave deformations is often contaminated with *** the present study,a new workfow to correct the interferometric phase and quantitatively select interferograms is proposed to improve the accuracy of interseismic deformation ***,the Generic Atmospheric Correction Online Service(GACOS),Intermittent Code for Atmospheric Noise Depression through Iterative Stacking(I-CANDIS),and plate model are combined to correct the atmospheric screen and long-wave ramp ***,the Pearson’s Correlation Coefcient(PCC)between the interferometric phase and the Global Navigation Satellite System(GNSS)constrained interseismic model as well as the STandard Deviation(STD)of the interferometric phase are introduced as criteria to optimize the selection of ***,the intermittent stacking method is used to generate an average velocity map.A comprehensive test using Sentinel-1 images covering the Haiyuan Fault Zone validate the efectiveness of our workfow in measuring interseismic *** demonstrates that the proposed joint InSAR-GNSS workfow can be extended to study the subtle interseismic deformations of major fault systems in Tibet and worldwide.