Deformation in the Three Gorges Reservoir after the first impoundment determined by GPS measurements

作     者：DU Ruilin 1,2 , QIAO Xuejun 1,2 *, WANG Qi 1,2 , XING Canfei 1,2 and YOU Xinzhao 1,3 (1. Institute of Seismology, CEA, Wuhan 430071, China 2. Laboratory of Crustal Movement and Earth Observation, Wuhan 430071, China 3. Center for Analysis and Prediction, CEA, Beijing 100036, China) 

作者机构：Institute of Seismology CEA Wuhan 430071 China Laboratory of Crustal Movement and Earth Observation Wuhan 430071 China Center for Analysis and Prediction CEA Beijing 100036 China 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2005年第15卷第6期

页      面：515-522页

核心收录：

学科分类：081504[工学-水利水电工程] 08[工学] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：SupportedbyNationalNaturalScienceFoundationofChina(GrantNos.40274007and40304002) SeismologicalUnionFundofChineseSeismologicalBureau(103030 602015) theMinistryofScienceandTechnologyofChinaandtheSpecialFundofThreeGorgesProjectExploitingCorporation 

主　　题：Three Gorges GPS impoundment deformation. 

摘      要：A 6-year long GPS observation (1998—2003) indicates that crustal deformation in the Three Gorges area is less active at a marginally measurable rate of 0—5 mm/a relative to stable South China block. However, the impounding water in June 2003 has induced transient displacement at the Three Gorges dam and the emerging reservoir. GPS measurements after the first stage of water filling of the reservoir demonstrate that vertical subsidence close by Yangtze River is about 10—40 mm, and the horizontal displacement is less than 5—10 mm. The maximum subsidence induced by the impoundment is located in the segment of the reservoir from Maoping to Xiangxi. The water loading-induced deformation diminishes rapidly with the distance from banks of the reservoir. The overall pattern of transient deformation is consistent with the simulation result of Farrell, and is attributed to the elastic response of upper lithosphere crust to overlying water reservoir.