安徽CORS参考站三维速度场分析

利用GAMIT/GLOBK软件处理安徽连续运行参考站(Continuously Operating Reference Stations,CORS)2011-11~2013-09近2 a的数据,获取了参考站的三维速度场,并分析了安徽省地壳水平运动和陆地垂直运动。结果表明,安徽CORS参考站在ITRF2008框架下的平均水平运动速率为34.44 mm/a,方向为E18.01°S;相对于欧亚板块的平均水平运动速率为6.13 mm/a,方向为E7.31°S;在安徽CORS整体无净旋转基准下,淮北平原的参考站存在1~4 mm/a的水平相对运动。郯庐断裂带在嘉山至泗县一带表现为左旋运动,嘉山以南运动较弱。在垂直方向上,安徽CORS参考站大致以淮河为界表现出南升北降的态势。淮河以南平均隆升速率为2.72 mm/a,淮河以北平均沉降速率为2.98 mm/a。该地区的地面沉降可能与过量抽取地下水和矿产开发等人为因素有关。

Analysis of Anhui CORS Reference Stations 3D Velocity Field

The most important causes of horizontal reference stations are human factors such as excessive pumping of groundwater and immoderate mineral exploitation. GPS data from Anhui Operating Reference Stations(AHCORS) between 2011-11 and 2013-9 was continuously processed the using GAMIT/GLOBK software. Then, based on these results, the 3D velocities of the reference stations were determined, and crustal horizontal movement and land vertical movement was analyzed in detail. It was found that the mean horizontal velocity of AHCORS reference stations was 34.44 mm/a in the direction of E18.01°S under ITRF2008 reference frame and 6.13 mm/a in the direction of E7.31°S with regard to the Eurasia Plate. Stations located in Huaibei Plain have moved in horizontal with 1~4 mm/a relative to No-Net-Rotation of the whole AHCORS. Tancheng-Lujiang Fault showed sinistral strike slip feature between Jiashan and Sixian, with very weak movement in the south of Jiashan. As for the vertical direction, AHCORS reference stations uplift in the south of the Huai River, but subside in the north of it. The average uplift rate of the stations located in the south of the Huai River is 2.72 mm/a, while the average subside rate of the stations located in the north of the Huai River is 2.98 mm/a.