Characteristics of present-day tectonics movement of typical faults in northern Tianshan mountain deduced from GPS observation

Based on the latest multiple-epoch observation data of the GPS sites in northern Tianshan mountain, this paper obtained the present-day GPS sites velocity fields of the crustal movement in northern Tianshan mountain, using GAMIT/GLOBK processing software. Based on an elastic half-space dislocation model, slip rate of the two typical faults are constrained by GPS-derived crustal deformation displacement velocities of the northern Tianshan mountain. One fault is Boluokenu-Aqikekuduke (BoA for short) fault, and the other is southern margin fault of Junggar basin. The GPS results show that the slip rate difference between east and west segment of right-lateral strike-slip BoA fault is not obvious. The fault exhibted creeping slightly with micro-seismicity within 1—2 mm/a since M_S7.2 south Wusu earthquake occurred on March 10, 1944. The present-day slip rate in southern margin fault of Junggar basin almost keeps (5.6±1.0) mm/a.