天津地区的垂直形变与构造活动研究

VERTICAL DEFORMATION AND TECTONIC ACTIVITY IN TIANJIN AREA

根据1992—2008年的水准观测资料计算结果,研究了天津地区的地面垂直升降变化。使用多项式函数对每条测线上的漏斗进行了计算,排除因开采地下水造成的沉降干扰,对所得结果分块拟合,绘制了垂直形变速度图,并计算了主要活动断裂带的垂直活动速率,在此基础上研究了天津地区的块体和断裂带的现今活动性。研究结果表明：垂直形变反映出天津地壳块体有的为掀斜活动,有的为整体性上升或者下降;块体的垂直变化差异幅度亦有大有小,活动程度亦存在差别;本区断裂的垂直活动速率在0.13-0.48 mm/a,平均速率为0.29 mm/a。

On the basis of the calculated results vertical variations of the ground were studied and the of the leveling data of Tianjin area during 1992 -2008, the funnels of every survey line were calculated by polynomial function as well. After eliminating the settling influence of the groundwater pumping, the results are then fitted individually in each block, the diagrams of the vertical deformation rate were mapped, and the vertical velocities of the main fault zone were calculated. On the basis of the results of the studies the activities of block and fault zone in Tianjin were investigated. The vertical deformation reflects that some blocks in the Tianjin appear tilting and some appear rise or fall. The vertical variety divergences are different. The vertical velocity of the fault zone in Tianjin area is between 0. 13 - 0.48 mm/a, the average velocity is 0.29 mm/a.