Crustal horizontal movement and distortion of northeastern margin of Qinghai-Tibet block based on GPS

Northeastern margin of Qinghai-Tibet block is an important tectonic movement boundary,and is also a window to research on crustal movement of Qinghai-Tibet Plateau.Through studying geology structure and tectonic-dynamic characteristics of test areas,it is of great significance not only for Qinghai-Tibet Plateau itself,but also for correctly realizing and analyzing present-day tectonic deformation and dynamic mechanism in northwest China.Based on GPS observation data of the National Natural Science Foundation of China from 1999 to 2001 and data of the Mechanism and Forecast of Mainland Strong Shockin 1999,2001,2003,on basis of GAMIT/GLOBK,the horizontal movement rate-field in northeastern margin of Qinghai-Tibet block is obtained,which is relative to stable Eurasian continent and Dingxin reference station from 1999 to 2001.Combined with mechanism of tectonic movement and geodynamics,the main conclusion shows that:(1)GPS technique is feasible to survey of earth's crust movement;(2)the movement displacement of GPS stations in Qilian-Haiyuan repture zone is suitable to geological results;(3)after collision between India continent and Eurasian continent,the India continent still keeps on pushing towards north by 50 mm/a;(4)the west part of Gansu-Qinghai block' crustal movement characteristics is dominated by N-S compression and crustal shortening,but east part rotates clock-wisely as an integral rigid body;(4)the Erdos block may take anti-clockwise rotation driven by Gansu-Qinghai rotating block,and velocity reaches maximum in northwest part of Liupan mountain fault.