福建地区地壳变形特征研究

摘要

利用福建地区GPS连续观测资料,对该区的地壳变形总体特征及应变分配情况进行了研究.主应变率结果表明,福建沿海地区以NW向挤压变形为主；应变率量值在福建东南沿海最大,向内陆地区量值逐渐减小、方向逐渐偏转；政和-海丰断裂两侧存在明显变形差异,西侧以NE向挤压为主,东侧的东南沿海地区(26°N以南)以NW-EW向挤压为主,东北沿海地区(26°N以北)以NW-NS向挤压为主,并且该断裂带附近存在明显的剪切运动.福建沿海地区部分测站运动特征表明该区存在较明显的剪切变形.%The characteristics of crustal deformation and strain allocation in Fujian region are studied with continuous observation GPS data.The results of principal strain rate show that the direction of the principal extrusion deformation is NW in the coastal areas,and strain rate values is the largest in the southeast coastal area of Fujian,the strain rate values decreased gradually from the coastal areas to inland areas,at the same time,its direction deflected gradually.Meanwhile,deformation in two sides of the Zhenghe-Haifeng fault is obviously different.On its west side the direction of the principal extrusion deformation is NW,while on the east side of the southeast coastal areas (south of 26 ° N),the direction is NW-EW,and in the northeast coastal area (north of 26 ° N),the direction is NW-NS.On the other hand,there is a distinct shear deformation near the fault.The movement characteristics of some GPS stations in coastal area of Fjuian show that shear deformation is obvious in the region.