Using repeated precise gps campaigns for research of present-day crustal movement and strain in the Qinghai-Tibetan Plateau  

作　　者：LIU Jingnan XU Caijun SONG Chenghua SHI Chuang JIANG Weiping DONG Lixiang 

机构地区：[1]GPS Engineering Research Center,Wuhan University,Wuhan 430079,China [2]School of Geo-science and Surveying Engineering,Wuhan University,Wuhan 430079,China

出　　处：《Chinese Science Bulletin》2001年第8期694-698,共5页

基　　金：the National NaturalScience Foundation of China (Grant Nos. 49234070, 49974001 and 49904001) and the National Outstanding Youth Science Foundation (Grant No. 49725411).

摘　　要：The problem of crustal movement in the Qing-hai-Tibetan Plateau is a hotstopic of the present-day international geodetic world. GPS observations in 1993, 1995 and 1997 are used to survey the three-dimensional displacement of GPS monitoring station in the Qinghai-Tibetan Plateau, and to calculate and analyze the present-day crustal movement and strain in the Qinghai-Tibetan Plateau. The result of repeated campaign shows that the crustal movement in the Qinghai-Tibetan Plateau is still compressing in the north and south directions, extending in the west and east directions, and uplifting in the vertical direction. The relative convergence velocity of the Himalayan block is approximately (19.5±1.7)mm/a, the strain velocity is about (5.5±6.0) mm/a, and the uplifting velocity is some (7.6±5.2) mm/a. The compression velocity of the Tibet block relative to Golmud in the north and south directions is (9.3±4.6) mm/a, the strain velocity of the middle part in the west and east directions is (15.6±6.3) mm/a,The problem of crustal movement in the Qinghai-Tibetan Plateau is a hotstopic of the present-day international geodetic world. GPS observations in 1993, 1995 and 1997 are used to survey the three-dimensional displacement of GPS monitoring station in the Qinghai-Tibetan Plateau, and to calculate and analyze the present-day crustal movement and strain in the Qinghai-Tibetan Plateau. The result of repeated campaign shows that the crustal movement in the Qinghai-Tibetan Plateau is still compressing in the north and south directions, extending in the west and east directions, and uplifting in the vertical direction. The relative convergence velocity of the Himalayan block is approximately (19.5±1.7)mm/a, the strain velocity is about (5.5±6.0) mm/a, and the uplifting velocity is some (7.6±5.2) mm/a. The compression velocity of the Tibet block relative to Golmud in the north and south directions is (9.3±4.6) mm/a, the strain velocity of the middle part in the west and east directions is (15.6 ±6.3) mm/a, reflecting the plateau lateral extruding movement. The Himalayan block is mainly compressing strain, and the middle part of the Tibet block is mainly extending strain. The highest extending and the compressing strain are 0.131×10?6/a and ?0.189×10?6/a, respectively.

关 键 词：GPS SURVEYING Qinghai-Tibetan Plateau CRUSTAL move- ment STRAIN analysis. 

分 类 号：P228.4[天文地球—大地测量学与测量工程]