用速度场得到的华北地区活动块体及变形  

REFERENCES ACTIVE BLOCKS AND THEIR DEFORMA-TIONS DERIVED FROM THE VELOCITY FIELD IN NORTH CHINA

作　　者：黄立人[1] 杨国华[1] 王敏[1] 

机构地区：[1]中国地震局第一地形变监测中心,中国天津300180

出　　处：《地震学报》2003年第1期72-81,共10页Acta Seismologica Sinica

基　　金：国家重点基础研究发展规划项目<大陆强震机理与预测>(G199804703)资助.

摘　　要：利用1992～2001年华北地区多次GPS测量得到的该地区144个测站的水平运动速率和它们的误差估计,研究了该地区的水平形变,确定了华北现今主要活动地块的运动、整体变形、局部变形和边界带的活动强度和方式,并据此估计了强震危险性.在研究中水平位移观测值被分解成3部分位移的叠加,即第一部分是整个华北地区跟随欧亚板块的运动,这一部分可由NUVAL-IA模型确定;第二部分是研究区内各次级构造块体的相对运动和变形,它可以由本文推广的QUAD方法所确定一组点的位移观测值确定;第三部分是次级块体内的局部变形和误差,这一部分的变形可以用块体的非均匀应变来描述.文中详细介绍了方法和结果.Based on the horizontal movement velocities and their error estimations at 144 GPS stations in North China deduced from the results obtained from many GPS measurements carried out in the period of 1992～2001, the horizontal deformation in the area is studied. The movements, entire deformations, local deformations, activity patterns and intensities along the boundary zones are derived. And then the risk of strong earthquake in the area is estimated. In the research, the horizontal displacement observations can be considered as the sum of three parts of horizontal displacements: the first part is the entire motion following Eurasia plate which can be derived from NUVAL-IA model; the second part is caused by the relative motions between the sub-tectonic blocks and the entire deformation within a block. It can be derived from a set of displacement observations that are determined by an expanded QUAD method; the third part can be seen as the local deformations and errors that can be described as the inhomogeneous strains with errors. The method and results are introduced in detail in the paper.

关 键 词：速度场 华北地区 活动块体 GPS测量 地壳运动 地震危险性 地壳变形 

分 类 号：P315.2[天文地球—地震学]