Monitoring Temporal and Spatial Changes of Crustal Deformation and Gravity Field Caused by Environmental Load in the Three Gorges Reservoir Region Based on CORS Network

Due to the geodynamic factors, especially the earth's surface atmosphere, surface water and groundwater hydrodynamic environment, ground site location, earth gravity field and geoid level change over time. Based on the Three Gorges CORS stations network and a small number of gravity stations, the crustal deformation and monthly gravity change of the Three Gorges area from January 2011 to June 2015 are calculated and analyzed in this paper by combination of load deformation and gravity field. The results show that:(1) CORS network has the ability to monitor the vertical deformation of the crust, ground gravity and geoid change. (2) The annual variation of the crustal vertical deformation in the Three Gorges area is 36.1 mm, the annual variation range of the geoid is 28.2 mm, and the annual variation of ground gravity is 117.4 μGal. (3) The accuracy of ground gravity change monitoring level of CORS network is not lower than the accuracy of flow gravity field. (4) Vertical deformation and ground gravity change monitoring has a certain ability of extrapolation forecasting.