Abstract:On the basis of the GPS measurement data in 2005—2007 along the railway in central Lhasa block, combining with the parameters of regional active faults and topographicgeomorphic character and historical strong earthquake, the characteristics of presentday crustal movement and deformation and main fault activity along the railway in the middle of Lhasa block are analyzed. The conclusions are drawn as follows.1)The presentday horizontal movement direction of the studied area is WENEE,consistent with the Tibetan plateau movement background by the northward collision of the India block that reflects the joint action of the horizontal dynamics from both the northsouthward horizontal compression and the eastward matter flow.2)The regional apparent strain distribution manifests itself in the different mode in different zone that closely related to the crust extension deformation made and reflects the divergence of the basin extension deformation with the ‘basinmountain’ tectonic activity of pressed and rise mountainous region.3)Active velocities of the faults:F76,F67 and F50 evidently descent from S to N,in the spaces that they intersect with the NENNE faults F73 and F65 and their adjant area of high apparent strain distribution the historical seismic activity was very strong it reflects the inherit of tectonic activity and deformation.
Wang Shuangxu ,Zhang Xiaoliang ,Zhang Xi et al. RESEARCH ON PRESENTDAY CRUSTAL MOVEMENT ANDDEFORMATION IN MIDDLE OF LHASA BLOCK FROM GPS OBSERVATION[J]. jgg, 2010, 30(4): 43-50.