Time Series InSAR Measurement for Earth Environmental Monitoring and Resource Management: A Case Study of Jiaocheng-Qingxu Area

We use ALOS-1 (2007-2010) and Sentinel-1A (2017-2018) archive data to monitor the land subsidence in the Jiaocheng-Qingxu area of Shanxi. By combining the advantages of small baseline subset and persistent scatterer technology, the deformation rate and time series settlement of the study area are obtained by two-dimensional linear regression analysis based on increasing the time sampling density. When compared with the GPS observations in the same period, it shows that the ground subsidence continues in the Jiaocheng-Qingxu area, but the spatial distribution and magnitude of the observed deformation in the mountainous and plain areas are different, and the causes of deformation are also different. The maximum subsidence rate in the plain area is -200 mm/a respectively, which are believed to be mainly controlled by structural faults; there are obvious differential subsidences on both sides of the fault. Groundwater over-exploitation is a main reason for subsidence, but the land subsidence disaster has been alleviated after treatment. In the mountainous area, due to the long-term exploitation of mineral resources, the subsidence center has been moving southward, and the maximum subsidence rate is -462 mm/a.