基于GPS观测的北天山主要断裂现今构造运动特征研究

李杰; 陈刚; 魏文薪; 帕尔哈提再努拉; 王晓强; 刘代芹; 李桂荣; 方伟; 陈述江; 孙小旭

基于GPS观测的北天山主要断裂现今构造运动特征研究

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

摘要

摘要: 借助分布在北天山地区最新GPS点位的运动观测资料, 利用GAMIT/GLOBK数据处理软件获取了北天山地区现今地壳的运动位移场．以该位移场为基础, 利用弹性半空间位错理论, 估算了研究区内博罗科努—阿其克库杜克断裂和准噶尔盆地南缘断裂两条具有代表性的主要断裂的现今活动速率．结果表明：博罗科努—阿其克库杜克右旋走滑断裂东、西两段滑移速率的差异性不明显, 1944年3月10日乌苏南M_S7.2强震发生后, 该断层现今表现为震后微蠕滑运动, 东、西两段滑动速率均在1—2 mm/a之间；准噶尔盆地南缘断裂现今滑动速率为(5.6±1.0) mm/a．

Abstract: 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.

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