Variation Features Of Gravity Field Caused By Crustal Movement

Variation features of gravity field caused by crustal movement and deformation is one of the objectives of satellite gravity survey. At the same time, the model of crustal movement is another hot-problem. Combined satellite gravity survey with crustal movement model, the research on the variation of regional gravity field caused by crustal motion has become a new exploration based on the gravity field variation.1. The paper describes the development of satellite gravity detection technology and its application in geology. Then, describes the movements and deformation of crystal'models about gravity survey at home and abroad.2. The GRACE satellite system, the major gravity field models and the basic principles of using GRACE data to calculate the changes of gravity field are introduced. The following works are mainly completed based on understanding the basis of those principles: calculation of the accuracy of gravity field model, calculation of Legendre function, and calculation of Gaussian smoothing. Finally, give the Earth's gravity field changes about GRACE satellite 09-02s on different orders.3. Derived formula of gravity anomalies about vertical rectangular, established a model of gravity anomalies about vertical rectangular. According to the model to simulate the gravity field changes, inclued a single block's gravity anomalies after telescopic movement and translational motion respectively. And analysis the characteristics of gravity anomalies of a single block in the event of the exercise. Finally, do a vertical rectangular model further expanded to form a multi-unit block model.4. Give a more detailed reference to the geological structure of western China and the major tectonic movement characteristics of the background. Then, use GRACE satellite data of GSM (2009-2004) in 120 bands to calculated gravity anomalies in the western region. And use the existing GPS observations to simulate the distributions of external gravitational field under two situations (taking into account the changes in topography and disregard of the changes in topography),Which movements on western region of China are caused by the action of the Indian plate. Finally, by comparing the satellite gravity results and the simulated results (combined with geological data), analysis of the gravity field in western China variations and differences caused by these two factors results are given.