Geodetic constraints on contemporary three-dimensional crustal deformation in the Laji Shan—Jishi Shan tectonic belt  

作　　者：Wenquan Zhuang Duxin Cui Ming Hao Shangwu Song Zhangjun Li 

机构地区：[1]The Second Monitoring and Application Center,China Earthquake Administration,Xi'an 710054,China

出　　处：《Geodesy and Geodynamics》2023年第6期589-596,共8页大地测量与地球动力学（英文版）

基　　金：supported by the National Science Foundation of China(41874117);the Second Tibetan Plateau Scientific Expedition and Research Program(SETP)(2019QZKK0901);Natural Science Basic Research Program of Shaanxi(Program No.2023-JC-ON-0309)。

摘　　要：The Laji Shan—Jishi Shan tectonic belt(LJTB),located in the southern part of the northeastern Tibetan Plateau(NETP),is a tectonic window to reveal regional tectonic deformation in the NETP.However,its kinematics in the Holocene remains controversial.We obtain the latest and dense horizontal velocity field based on data collected from our newly constructed and existing GNSS stations.Combined with fault kinematics from geologic observations,we analyze the crustal deformation characteristics along the LJTB.The results show that:(1)The Laji Shan fault(LJF)is inactive,and the northwest-oriented Jishi Shan fault(JSF)exhibits a significant dextral and thrust slip.(2)The transpression along the arc-shaped LJTB accommodates deformation transformation between the dextral Riyue Shan fault and the sinistral west Qinling fault.(3)With the continuous pushing of the Indian plate,internal strains in the Tibetan Plateau are continuously transferred in the northeast via the LJTB as they are gradually dissipated near the LJTB and translated into significant crustal uplift in these regions.

关 键 词：Laji Shan-Jishi Shan tectonic belt Three-dimensional crustal deformation Fault slip rate GNSS Velocity field 

分 类 号：P227[天文地球—大地测量学与测量工程]