Complex surface deformation monitoring and mechanism inversion over Qingxu-Jiaocheng, China with multi-sensor SAR images. (February 2018)

• Record Type: Journal Article
• Authors: Liu, Yuanyuan; Zhao, Chaoying; Zhang, Qin; Yang, Chengsheng
• Is Part Of: Journal of geodynamics. Volume 114(2018)
• Page Start: 41
• Page End: 52
• Publication Date: 2018-02
• Subjects: InSAR -- Multi-sensor SAR images -- Land subsidence -- Fault movement -- Monitoring -- Inversion; Geodynamics -- Periodicals; Earth movements -- Periodicals; Rock deformation -- Periodicals; Earth -- Internal structure -- Periodicals; 551.1
• DOI: 10.1016/j.jog.2018.01.016
• Languages: English
• ISSNs: 0264-3707

Abstract

Highlights: Reveal over 20 years' land subsidence spatial-temporal evolution using multi-sensor SAR images. Decompose the east-west and vertical deformation with descending and ascending SAR data. Inverse the land subsidence mechanism by distributed contracting sills to explain effect of the underground water. Separate the fault movement by subtracting groundwater induced land subsidence. Abstract: Qingxu-Jiaocheng, China has been suffering severe land subsidence along with the development of ground fissure, which are controlled by local fault and triggered by groundwater withdrawal. With multi-sensor SAR images, we study the spatiotemporal evolution of ground deformation over Qingxu-Jiaocheng with an IPTA InSAR technique and assess the role of groundwater withdrawal to the observed deformation. Discrete GPS measurements are applied to verify the InSAR results. The RMSE of the differences between InSAR and GPS, i.e. ALOS and GPS and Envisat and GPS, are 5.7 mm and 6.3 mm in the LOS direction, respectively. The east-west and vertical components of the observed deformation from 2007 to 2010 are decomposed by using descending-track Envisat and ascending-track ALOS interferograms, indicating that the east-west component cannot be neglected when the deformation is large or the ground fissure is active. Four phases of land subsidence in the study region are successfully retrieved, and its spatiotemporal evolution is quantitatively analyzed. Lastly, a flat lying sill model with distributed contractions is implemented to model the InSAR deformation over Qingxu-Jiaocheng, which manifests that the ground deformation is mainly caused by groundwater withdrawal. This research provides new insights into the land subsidence monitoring and its mechanism inversion over Qingxu-Jiaocheng region.