天山中段水平地壳形变特征研究

针对天山中段地区水平地壳形变特征最新动态的研究问题,提出了利用GPS连续站及流动站资料,基于速度场结果进行GPS剖面分析的方法来进行研究。结合速度场及剖面结果可以看出,北西走向的喀什河断裂带,1992—2011背景走滑运动为右旋走滑,2009—2014年右旋运动有所减弱,2013—2015年仍然较弱;天山中部的滑脱断层,1992—2011年的结果显示其走滑运动较不明显,但2009—2014期的结果表明出现了一定的左旋运动,2013—2015年的左旋运动加剧;天山中部的滑动速率结果显示出天山中段博罗科努断裂带中段变形速率较东西两侧均较小,值得进一步关注。研究结果利用了最新数据,显示了天山中段水平地壳形变的最新特征,为判定天山中段地区的地震危险性提供了支持。

Research on the deformation characteristics of middle-Tianshan region in recent period

According to the latest horizontal crustal deformation characteristics of the middle Tianshan region,this paper used profile analysis method to study the problem based on the data of GPS continuous and campaign stations.Based on the velocity field and the results of GPS profile,the results are shown as following:Kashihe river fault,which is a north-west fracture,the background strike-slip movement in 1992-2011 is dextral,and the dextral movement is weakened in 2009-2014,it is more weaker in 2013-2015;the strike-slip movement of detachment fault in central Tianshan mountains in 1992-2011 is not obvious,but the results show that in the 2009-2014,it appeared a certain sinistral movement,the sinistral movement intensified in 2013-2015;Slip rate results showed that deformation rate of the middle of the Boluokenu fault zone in central Tianshan region is smaller than the both sides.Results in this paper indicated the new characteristics of crustal deformation of middle-Tianshan region by using the latest data,provided support for determining the seismic hazard region in middle-Tianshan.