华北地壳运动新特征  

NEW FEATURES OF CRUSTAL MOTION IN NORTH CHINA

作　　者：杨国华[1] 韩月萍[1] 周晓燕[1] 

机构地区：[1]中国地震局第一地形变监测中心,天津300180

出　　处：《大地测量与地球动力学》2002年第3期28-33,共6页Journal of Geodesy and Geodynamics

基　　金：国家重点基础研究发展规划项目G19980 40 70 ;国家"十五"科技攻关项目 (2 0 0 1BA60 1B0 2 )

摘　　要：通过对华北地区GPS资料、垂直形变资料和山西断裂带GPS资料的综合分析 ,发现 2 0 0 1年的地壳运动与以前有一定的不同 ,主要表现为 :①首都圈地区的垂直运动强度有明显的提高 ,并在京西地区形成了四象限形变图像。②山西断裂带北段水平运动与趋势运动几乎相反 ,以代县为中心 ,北部区段相对向东运动 ,南部区段相对向西运动。③华北地区 1999～ 2 0 0 1年水平运动的变化特征为 :天津—大同地带差异性活动最为突出 ,失去了原有的左旋活动特征 ,并显示有东西向挤压的迹象 ;北京地区则表现为南北向挤压。这样的结果可能表明 ,华北目前存在着应力扰动或调整的行为。若这种行为持续作用 ,未来华北地区地震活动水平与强度将会有所提高 。Some changes of crustal motion in 2001 is found on the basis of GPS data, vertical deformation data in North China and GPS data along Shanxi fault zone. The changes mainly manifest themselves in the following aspects: ① vertical crust motion in Capital circle is enhanced obviously, and four quadrant pattern is froming in the west of Beijing area; ②the horizontal motion in the north part of Shanxi fault zone is contrary to the trend motion, if taking the Daixian as a center the northern section of the zone moves eastwards and the southern section westwards; ③a basic character of horizontal motion between Tianjin and Datong in North China from 1999 to 2001 is out of order. The character of left lateral motion disappears, and seems to be on extrusion in EW direction. It indicates possibly that there is stress disturbance in North China. In North China, if the motion with above character is persitent the level and intension of seismic activity will increase. The area between Datong and Tianjin as well as the adjacent areas of Daixian as a center would be a main area of moderate strong seismicity.

关 键 词：华北地区 地壳水平运动 地壳垂直运动 动态特征 首都圈地区 

分 类 号：P227[天文地球—大地测量学与测量工程]