华北(北部)地区的地壳水平运动特征及其模型——GPS测量结果的初步分析

根据两次ＧＰＳ测量结果,研究了华北（北部）地区的现今地壳水平运动的特征。其主要特征可以用１个４块体的构造运动模型来描述。利用构造单元内的最大相对稳定点组求出了模型中的运动参数,并据此研究了构造边界带上的差异运动和应变积累方式。同时还用两种不同的方法求得了相当一致的构造块体内的局部变形。最后讨论了这种运动特征对地震危险性预测的意义。

CRUSTAL HORIZONTAL MOTION MODEL AND ITS FEATURES IN NORTHERN PART OF NORTH CHINA: PRELIMINARY ANALYSIS OF GPS MEASUREMENT DATA

Based on data of two GPS measurement campaigns, the recent crustal horizontal movement features in northern part of North China are studied. Main features of the recent crustal movement in the area can be descriibed by a four block tectonic motion model. Motion parameters of the model are derived from displacement vectors at relative stable stations in a so-called "Maximum Relative Stable Station Group" in each tectonic unit. On the basis of obtained results, differential motions or possible strain accumulation patterns on tectonic boundary zones between the blocks are studied. At the same time, local deformation in each tectonic block is also derived using two different methods. Results obtained from the two methods show almost no difference. Finally, meanings of the movement features in earthquake risk prediction are discussed.