摘要
Through GPS carrier phases observation in southwestern China during 1991-1997,the velocity field within eastern Qinghai-Xizang (Tibet) and its neighbour regions has been es-’tablished. The velocity of those sites in and west of Chuan-Dian block is mostly 5-10 mm·a-1relative to the fiduciary station CHDU (Chengdu), and the motion in Chuan-Qing and
Through GPS carrier phases observation in southwestern China during 1991–1997, the velocity field within eastern Qinghai-Xizang (Tibet) and its neighbour regions has been established. The velocity of those sites in and west of Chuan-Dian block is mostly 5–10 mm · a?1 relative to the fiduciary station CHDU (Chengdu), and the motion in Chuan-Qing and Yangtze blocks east of the Xianshuihe-Xiaojiang fault is weak with a velocity of about 0–7 mm · a?1. The velocity vector in these areas indicates a clockwise rotation vortex rather than the so-called intensive eastward pushing or eastward escape. The main pattern of the crustal deformation is a clockwise rotation vortex structure and a differential slip along the boundary fault between different blocks.
