某水准路线所经地区现代升降运动的初步探讨

本文主要是利用水准复测资料来阐述某地区的现代升降运动。文中将复、初测高程进行比较,作出了现代地壳运动幅度图,图中看出东都上升幅度小,速度梯度变化也小;西部上升幅度大,速度梯度变化也大。在整个剖面中更可以看出,在较短距离内出现大幅度的隆起,隆起中又有相对凹陷。由实际资料得出,本区现代地壳运动有继承性,并出现三种类型的上升运动:(1)平稳的上升运动;(2)掀斜的上升运动;(3)强烈隆起。

A PRELIMINARY SURVEY OF THE RECENT VERTICAL CRUSTAL MOVEMENTS IN AN AREA

This paper chiefly explains the recent vertical movements in a region with the data provided by repeated levellings. By analysing the accuracy of the levelling,the data are made reliable. After making a comparison of the altitude of the primary levelling with that of the relevelling,the authers offer a sketch to show the amount of the recent crustal movements. Thus in the whole area a considerable amount of uplifting with smaller amount in the eastern part at a low speed and steep gradient,and a larger amount in the wester part at a high speed and moderate gradient are detected.Within a comparatively short dis- tance,it reveals,as shown in the cross-section,a regional uplift usually with relative depression therein.Basing upon the geological and geomorphological data collected,the recent vertical crustal movements in different tectonic regions are discussed. From the above-mentioned facts there comes a conclusion that the recent tectonic movements in the surveyed area obviously inherit from the older one and show three types of uplifting: 1)Moderate uplift; 2)Inclinal uplift; 3)Strong uplift.