Study Of The Algorithm On Establishing Model Of Crustal Movement Velocity In China Mainland

China geodetic coordinate system of2000(CGCS2000) was officially used on July1in2008in our country. At present, CGCS2000coordinate system can only provide static coordinates corresponding international earth reference frame ITRF97and epoch at2000.0in our country. It brings inconvenience for the widespread adoption of the GPS precise positioning (ITRF2005frame and the current epoch). If you want to convert the epoch, you must have the high resolution velocity field data. Because distribution density based on the current framework points of CGCS2000is little, it cannot provide high density velocity information. Therefore, crustal movement velocity field model need to be established in mainland China. It can provide high density velocity model for maintaining CGCS2000coordinate system, through studying for the methods of establishing velocity model.Chinese mainland crustal movement velocity field are established by the data of network engineering. Site coordinates and velocity values were calculated based on observation data from1999to2009.It analysis crustal movement trend of mainland China. It establishes crustal movement velocity field model in China mainland using respectively methods, such as, inverse distance weighting, Euler vector, finite element method, the least-squares method. According to the analysis of different models and the suitable scope, it synthesizes the above methods in each block to build the optimal velocity model, calculates1°×1°grid point speed in mainland China, establishes grid velocity field model, introduce the application methods of velocity field model.It calculates vertical crustal movement velocity field, analysis regional vertical deformation of Hebei province, investigates the causes of Hebei regional land subsidence induced, based on the observation date of CORS network in Hebei province (2009-2012). The model of vertical crustal movement velocity field in Hebei is established based on method of polyhedral function and velocity of3O’×30’grid point is calculated and contour map of vertical movement velocity is drew. It can provide reference datum for the construction, earthquake prediction, subsidence hazard prediction and prevention, and other areas of the Hebei region, tec.