Sub-regional Descriptions of Global GPS Vector Field and Its Geodynamic Significance MA Zongjin, ZHANG Jin, REN Jinwei and LI Zhi (Institute of Geology, China Earthquake Administration, Beijing 100029; Institute of Earthquake Science, China Earthquake Administration, Beijing 100036; Academy of Equipment Command & Technology, Beijing 101416) Based on the global vector field of plate movement shown by GPS stations chosen averagely, some characteristics of present plate tectonics can be distinguished as follows: (1) from the northern