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????1999??2007??2009??2011???GPS???????????????????1999??2007????????????????????????????????????????С?????????С????????????2009??2011???????????????????????????????????????????????????????????????????????? 1999??2007?????????????60??10 ^-9/a??λ??????????山?????????-????????-???????????????????????2009??2011??????????????????????????????????????????????????????????С?????????Χ????????????60??10 ^-9/a??????????1999??2007???????????????????????????????????????????????????????????????????????2009??2011?????????η????????????????????????????????????20??10 ^-9 rad/a??С??4??10 ^-9 rad/a?????????????????????4??10 ^-9 rad/a????25??10 ^-9 rad/a?????????????????????????????????????40??10 ^-9 rad/a????Щ???????????????????α???????

PRESENT-DAY HORIZONTAL DEFORMATION AND ITS DYNAMIC CHARACTER IN XINJIANG AREA

The present day horizontal deformation and dynamic character derived from the latest GPS data of Xinjiang area in 1999-2007 and 2009-2011 is given.The results are as follows. The most of the regional characteristics of horizontal movement is complex and orderly, showing the feature of “the south big,the north small and the west big and the east small” in 1999-2007, which is inherited by that in 2009-2011, but the average value increases 1-2 mm/a, especially in the areas near Wenchuan and Yushu. The maximum value of surface shrinkage in 1999-2007 is about 60×10\+\{-9\}/a in the E and W direction, in alternating spatial distribution along Kepingtagg Qiulitagg Xingdi fault zone located at the north edge of the Tarim block. The surface strain in 2009-2011 is still of shrinkage mainly, but the magnitude is bigger than the previous. The surface expansion size and spatial distribution range is larger and the maximum value is about 60×10 ^-9/a. The distribution of left and right revolving deformation in 1999-2007 are zonal in EN WS direction and is alternating in WN ES direction respectively, but the order of revolving deformation in 2009-2011 is poor, the right revolving deformation value decreased from 20×10 ^-9 rad/a to 4×10 ^-9 rad/a in the joining zone of North and South Tianshan and in the Altyn Tagh fault the left revolving deformation value increased from 4×10 ^-9 rad/a to 25×10 ^-9 rad/a, Qilian fault’s revolving deformation is right from left and the maximum value is 40×10 ^-9 rad/a. These data show that there may be deformation adjustment in nearly two years.