???????????????????α?

??1999-2011?????????????GPS??????????????????????????????????????????????????????????????????????????????????????μ??????????????????????????????ε?????????????????????????????????????????????????????????δ?????????????????????????????????в???????????????????????????????????????????????????????????????????????????????в???????????????????????????????????????????????????????????紦???????????????????????????????????????????о????????????????????

RECENT HORIZONTAL CRUST DEFORMATION IN CENTRAL AND SOUTHERN QINGHAI-TIBET PLATEAU

Based on the GPS regional station observations from 1999-2011 in the Tibet and Qinghai areas, using Euler model, multi??kernel function method and the spherical strain model, the regional No??Net??Rotation frame motion field and strains are calculated in the central and southern Qinghai??Tibet Plateau, and compares and analyses the results before and after the Wenchuan earthquake. The results show: The general movement features of the study area did not change greatly over the years. The crust motion is generally the East??West tensive movement on the whole. In the central area, the crust motion is primarily the North??South compressive movement, and disparts from south to north gradually. The north movement is mainly concentrated in the central Himalaya block and Lhasa block, and obviously weakened in the north Lhasa block. While in boundary of the Lhasa block and Qiangtang block, the motion changes obviously as the East??West movement. The eastward motion is strengthened in the study area after the Wenchuan earthquake.