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Surface deformation,along National Highway 213 at the epicenter of Wenchuan M8 earthquake,at Yingxiu Town of Sichuan Province,China,is surveyed and measured in detail.The results show two distinct characteristics.One is that no horizontal displacement displays,or dextral strike-slip component at the observation point can not be found basically,the other is that uplift amount is 2.72 m,and the short-ening amount is 0.38 m,which reflects thrust shortening deformation is not obvious.The crust uplift amount of 2.71 m is distributed in a belt with width of 60 m.The model of lower crustal flow proposed by Royden et al.(1997) about the dynamic process in eastern margin of the Tibetan Plateau seems more suitable to explain the seismic surface deformation characteristics at Yingxiu Town,the epicenter of the May 12,2008 Wenchuan M8 Earthquake.
Surface deformation, along National Highway 213 at the epicenter of Wenchuan M8 earthquake, at Yingxiu Town of Sichuan Province, China, is surveyed and measured in detail. Results show two distinct characteristics. One of is no horizontal displacement displays, or dextral strike- slip component at the observation point can not be found basically, the other is that uplift amount is 2.72 m, and the short-ening amount is 0.38 m, which suggests thrust shortening deformation is not obvious. crust uplift amount of 2.71 m is distributed in a belt with width of 60 m. The model of lower crustal flow proposed by Royden et al. (1997) about the dynamic process in eastern margin of the Tibetan Plateau seems more suitable to explain the seismic surface deformation characteristics at Yingxiu Town, the epicenter of the May 12,2008 Wenchuan M8 Earthquake.