ACTIVITY FEATURE AND SLIP RATE OF MIDDLE SEGMENT OF ENSHI FAULT IN QUATERNARY
Cai Yongjian 1,2,3) ;Lei Dongning 1,2) ;Li Heng 1,2) ;Qiao Yueqiang 1,2) ; and Wu Jianchao 1,2)
1)Institute of Seismology, CEA, Wuhan 4300712)Institute of Earthquake Engineering of Wuhan,Wuhan 4300713)College of Earth Science, China University of Geosciences, Wuhan 430074
Abstract：On the basis of detailed geomorphologic analysis of faulting profiles and deformed alluvial fans, etc. we suggest that the Enshi fault had been intensely active in Quaternary,it is characterized by dominant dipslip and partly dextral movement component and the displacement of the proluvium fans developed at the valley mouth of a gully. The samples collected from the top of the proluvium fans were dated by Thermo luminescence to be 197.18±16.76 B.P. to 33.33±2.83 B. P. The horizontal slip rate of the middle segment of Enshi fault is determined to be 0.43-0.5 mm/a, and the vertical slip rate is determined to be 0.07-0.17 mm/a.
