华北平原地区的地面隆起与地壳运动

THE SURFACE UPLIFT AND CRUSTAL MOVEMENT IN NORTH CHINA PLAIN

对于华北平原地区的现今地壳运动,人们习惯用“继承性”来描述周边山区的上升和平原盆地本身的整体下沉.但这一现象究竞在多长的时间尺度上表现出来?地震在这一过程中的作用如何?是众所关心的问题.本文利用华北平原地区的多期大地水准测量成果,初步研究了平原内部的现今微隆起(以下简称隆起)与地壳运动的关系.笔者认为该区近20余年来出现的局部而分散的地面隆起,是伸展裂陷构造区地表形变特征之一.

Concerning the recent crustal deformatiom in North China Plain, it is generally believed that the rising of mountain regions around the plain and the subsidence of the whole basin itself have been the tectonic activities of inheritance since Cenozoic period. However, it is very difficult to tell how long this phenomenon has shown up in the time scale and how the earthquakes have acted. To solve these problems, a preliminary study on the uplift related to the crustal movement has been made in this paper, using the precise levelling data of various periods in North China Plain. The paper suggests that the local and scattered surface uplift presented in the vertical deformation contour map is one of the features in the extensional tectonic region.