Construction and Application of Chinese Crustal Motion Background Field Based on ITRF97 Frame

In this paper,the observation speed of the basic stations and fiducial stations of the crustal deformation monitoring network of China are used to computer the background field of Chinese Mainland area.The result is different from the background provided by NNR-NUVELI-A、Sillard、Larson or some other models.Based on the background field of Chinese Mainland area,the absolute movement of Chineses Mainland plates are primary in the southwest.The Xi-malaya plate and Lasa plate move north,but the Qiangtang area,Chuandian plate and Dianxi plate turn clockwise.In the east of Qiangtang plate,the move trend is east,and then clockwise transition.In Chuandian plate the move trend is southeast.To Dianxi plate the move trend is mainly southwest.The value is approximately 10-25 mm/a,and the deformation is distinct.And in Erdous plate and its nabe,it turn anticlockwise,so we should also pay more attention to these areas.