• 责任者：Ge Weipeng (State Key Laboratory of Earthquake Dynamics ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Wang Min
• 刊名：Chinese Journal of Geophysics
• 出版年：2013
• 卷期：56(9)
• 关键词：活动断层 ; active faults ; 地壳运动 ; crustal movement ; 柴达木盆地 ; Qaidam Basin ; 祁连山 ; Qilian Mountains
• 页码：p.2994-3010
• 图表：illus., 81 refs.
• 分类号：0300
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

     We discuss the strain rate fields and micro block models using the GPS velocity field in the Northern and Northeastern Tibetan Plateau based on active faults distribution and GPS velocity field.We calculate the tectonic strain rate fields using a spherical wavelet-based multiscale approach for estimating the spatial velocity field on the sphere from a set of geodetic displacement observations.The calculated results including the spatial gradient tensor quantities such as dilatation rate,strain rate and rotation rate could be used to discuss the regional tectonic environment.We also adopt the block model approach with Backslip model to establish a small spatial scale micro-block model,which is used to invert for the slip rates of active faults and compared with geological slip rates,as well as the uniform strain rates in blocks and Euler poles for each block.As a result,we consider that：（1） Crustal deformation along the Qilian Shan range possesses the motion characteristics of blocks with narrow belt shapes in NE direction.（2）Contemporary deformation fields of the Northern Tibetan Plateau should be the result of combined actions of the relative movement of active faults＇ two sides,thrust and extrusion of the thrust faults and micro-blocks rotation bounded by the principal and secondary active faults in the region.（3） Rotation state of GPS velocity field in the east of the region near Lanzhou and Tianshui has been the result of systematic differences in regional lithosphere structure which affects the driving mechanisms of smaller crustal blocks deformation consequently.