鲜水河断裂运动引起地表形变的向-位错模型模拟

基于三维向错理论模拟倾角为60°的矩形断层在转动角不同量级和形式下引起的地表形变，分析断层转动对地表形变大小及空间分布的影响。利用向-位错模型，采用数值方法模拟鲜水河断裂带断层滑动与转动引起的地表形变，并与扣除趋势项的2009~2015年的GPS实测结果进行对比。研究表明：1）转动角大小与断层向错引起的地表位移场大小呈正比关系，位移场方向不变，转动方向不同时，地表位移场方向随之改变，大小不变，且断层附近地表位移场影响较大；2）基于向-位错组合模型对鲜水河断裂带模拟结果与GPS结果在大小和方向上均具有较好的一致性；3）鲜水河断裂带表现出一定的旋转特性，存在明显的分段差异性，具有一定的转换构造样式。

Surface Deformation of the Xianshuihe Fault Zone Simulated by Disclination-Dislocation Model

First, based on the three-disclination model, this paper simulates the surface deformation of the single fault, which has a dip angle of 60° under the different angle and direction of rotation,in order to analyze the influence of fault rotation on the size of the surface deformation field and the characteristics of spatial distribution. Second, based on the disclination-dislocation model, the surface deformation caused by fault sliding and rotation of the Xianshuihe fault zone is simulated by numerical methods and is compared with the GPS data of 2009-2015, which eliminates the overall displacement. Result show: 1) the angle of rotation is proportional to the surface deformation caused by the disclination of fault, but the displacement field direction remains the same; when the direction of rotation changes, so does the surface displacement field, but the size remains the same, with greater impact on the displacement field near the fault; 2) based on the disclination-dislocation model, the simulated results and GPS measurements of the Xianshuihe fault zone show good consistency;3) there are some characteristics of rotation in Xianshuihe fault zone, with obvious differences with every block, and a certain transformation tectonic style.