Three-dimensional crustal deformation before and after the Wenchuan earthquake in Guanzhong and adjacent regions  

作　　者：Hu Yaxuan Qin Shanlan Hao Ming 

机构地区：[1]Second Crust Monitoring and Application Center, China Earthquake Administration

出　　处：《Geodesy and Geodynamics》2015年第1期16-24,共9页大地测量与地球动力学（英文版）

基　　金：supported by the Shanxi Science and Technology Research and Development program(2012SF2-17);National Nature Science Foundation of China(41174083)

摘　　要：The recent plethora of GPS observations compensates for the 20-year-old lack in vertical displacement data for the Guanzhong region. The 2001—2007 three-dimensional（3D） crustal deformation data suggest regional movement with a horizontal velocity of 3—7 mm/a,predominantly from SSE in the west to SE in the east, and vertical inherited movement with velocity of -7 mm/a to 4 mm/a. After the Wenchuan earthquake, the GPS data suggest that the effect of the earthquake on the regional deformation is greater in the west than the east.The horizontal displacement increased during 2007—2008; however, the reverse was observed in 2008—2009. The vertical displacement in the western part of the region increased in 2008 and has been gradually returning to normal since 2009; however, in the eastern part,the effect of the earthquake remains.The recent plethora of GPS observations compensates for the 20-year-old lack in vertical displacement data for the Guanzhong region. The 2001—2007 three-dimensional（3D） crustal deformation data suggest regional movement with a horizontal velocity of 3—7 mm/a,predominantly from SSE in the west to SE in the east, and vertical inherited movement with velocity of -7 mm/a to 4 mm/a. After the Wenchuan earthquake, the GPS data suggest that the effect of the earthquake on the regional deformation is greater in the west than the east.The horizontal displacement increased during 2007—2008; however, the reverse was observed in 2008—2009. The vertical displacement in the western part of the region increased in 2008 and has been gradually returning to normal since 2009; however, in the eastern part,the effect of the earthquake remains.

关 键 词：Horizontal movement Vertical movement Guanzhong area Wenchuan earthquake Geodynamics GPS（Global Position System） 

分 类 号：P315[天文地球—地震学] P227[天文地球—固体地球物理学]