关键词: GPS, 水平运动与应变, 动态特征, 华北地区

Abstract: On the basis of region with no-net rotation, and by using continuous strain model focused on extracting medium-low frequency strain information, the paper deals with and analyzes the re-measured GPS data (1999—2001—2004) obtained from more than 400 GPS monitoring stations and also the GPS data re-measured in 2006 from more than 130 GPS monitoring stations in North China in the Project of “China Crust Movement Observation Network”. We gain the relative motion velocity of 1999—2004 and 2004—2006, and acquire the displacement results of the deviation motion of 2004—2006 with respect to 1999—2004, the results suggest: ① The uneven strains in North China region are obvious, results of different periods distinct from each other in the spatial representation style; ② The movement characteristics of former and latter two periods are inconsistent to a certain extern; ③ There exists obvious deviation displacement in 2006, and shows a evidence of right revolving deformation, its the surface strain shows the characteristic of surface contraction in central and north part of the region; and superficial expansion in south part of the region; ④ The compression in the EW direction during recent two years is more obvious than before, to south of Beijing it is the area of movement conversion and the quadrant pseudo-center of surface strain. These may suggest that North China region enter the energy-accumulated period after Kunlun Mountain M_S8.1 earthquake.

Key words: GPS, Horizontal movement and strain, Dynamic characteristics, North China