基于GPS观测的地壳水平运动划分活动地块的试验

Test of Active Blocks Division Based on Horizontal Crustal Movement Observed by GPS

本文分析了板内块体与板块运动的差别 ,提出以Bursa公式作为板内块体的运动学模型 ,并据此提出了划分板内活动地块的方法。根据华北GPS网 1995、1996和 1999年的 3期观测成果 ,用本文提出的数学模型和方法 ,将华北北部地区划分为 8个小块体。本文用地壳水平运动划分的结果与用本区地壳垂直运动划分的结果在总体上是一致或相近的。本文的划分结果与新构造运动也基本一致 ,本区活动块体的现今运动是新构造运动的继承和发展。此外 ,用地壳水平运动划分的构造单元提示出本区一些新的活动特征。

In the paper, the difference between the movements of intraplate block and plate has been analyzed, the idea to use Bursa formula as the dynamic model for intraplate blocks has been suggested and the methods for dividing the intraplate active blocks have been proposed. Based on three periods of data from North China GPS Networks observed in 1995,1996 and 1999, and with the mathematical model and the methods proposed in the paper, the northern part of North China has been divided into 8 small blocks. The results of division based on horizontal crustal deformation and that based on vertical crustal deformation in the papper are generally consistent or similar. The result of division in the paper is basically consistent with the neotectonic movement, and the current movement of active blocks in this area is the inheritance and development of the neotectonics. In addition, the tectonic units divided according to the horizontal crustal movement have shown some characteristics of new activity.