Insar Analysis of Land Subsidence Caused by Groundwater Exploitation in Changping, Beijing, China

Land subsidence in Changping, Beijing of China, has been an ongoing problem for the past four decades (since the later 1970s). We use permanent scatterers interferometric synthetic aperture radar (PS-InSAR) technique to detect and measure ground movement in this area. The detail information of deformation shows that spatial extent of subsidence is controlled by geologic structures (Huangzhuang-Gaoliying and Nankou-Sunhe faults) and thickness of Quaternary sediment. Comparing the subsidence line to the aggregate clay thickness of Changping area, both of them are mostly consistent. The locations of high-subsidence areas coincided with areas of heavy groundwater use and the clay mud layer, which is thicker than 50 m.