Study on the crustal horizontal movement in Fujian and its neighbouring sea region in 1994 to 1997 based on several kinds of GPS surveying data

This paper provides a foundation for studying dynamics of marginal sea on t he southeast of China mainland. It is based on the data from GPS observatio n metwork of China continent and Fujian region as well as the data of IGS ( International GPS Service) tracing stations around China continent during t he years of 1994 to 1997. Two mechanics models of blocks movement and intra -block deformation are established. Velocity and strain rate fields of pres ent-day crustal horizontal movement in Fujian and its neighbouring sea regi on are firstly studied. The results indicate that Fujian and its neighbouri ng sea region as a whole horizontally moves towards southeast or east-south east, namely towards sea not only in China continent frame-work or in aroun d China continent frame work, but also relative to Taiwan, The average velo city is 11.2 + 3.0mm / a (by Fujian GPS network) or 14.0 +/- 4.0mm / a (by China GPS network). Meanwhile, in Fujian area there is a northwest movement directing from sea to hinterland. The average velocity is 3.0 +/- 2.6mm / a. The principal compressive axis of regional strain rate field lies in NW (NWW)-SE (SEE). The collision of Indian plate and Euro-Asian plate affects Fujian and its neighbouring sea region by several blocks' side-transferring in China continent. The obduction and jam of Philippines-sea plate to Taiw an (southeast margin of Euro-Asia continent) also affects this region. The jointly affection still exists today. The former is stronger than the latte r while the velocity field of the former is homogeneous and the one of the latte is not homogeneous.