青藏东北缘块体水平运动特征研究

HORIZONTAL MOVEMENT CHARACTERISTICS OF NORTHEASTERN MARGIN OF QINGHAI-TIBET CRUSTAL BLOCKS

借助均匀弹性块体应变模型,利用GPS观测获得的地壳水平运动速度场,分块计算各个块体的运动参数和应变参数。然后,利用计算获得的参数反算各个块体内部均匀变形场和相邻块体分界带的相对运动。在此基础上,结合构造特征,以及海原-六盘山弧形构造带的GPS速度剖面,研究了现今构造的活动性。

With the homogeneous elastic strain block model and the horizontal crustal movement velocity field obtained by GPS measurements, the movement parameters and strain parameters of the northeastern margin of the Qinghai-Tibet block are calculated. The uniform deformation of the blocks, and the relative boundary motion between the adjacent blocks including strike-slip and extrusion rate are calculated from the each block movement parameters and strain parameters. Combining with the tectonic characteristics and GPS velocity profile locating at Haiyuan-Liupan Arc, the present day tectonic activity are discussed.