摘要
在综合分析兰州庄浪河河流阶地发育和分布特征的基础上,采用高精度差分GPS对I～III级阶地进行了详细的测量,获得了庄浪河阶地纵横剖面图。结合不同级别阶地年代学资料研究了其构造变形特征,获得了穿越断裂带地区的阶地变形特点、变形带宽度、变形幅度和速率等定量参数。研究表明:兰州庄浪河阶地构造变形主要表现为断裂扩展褶皱模式,阶地变形速率在晚第四纪以来有逐渐加速的特点。
Based on the general analyzing the characteristics of distribution and development of the terraces along Zhuanglang river,in Lanzhou,the longitudinal and latitudinal profiles of Ⅰ-Ⅲ terraces are given by virtual of high-resolution differential GPS carried through detail surveying.According to the dating result of different terraces,their tectonic deformation characters are studied and the quantificational parameters of terrace deformation in fault area such as deformation characters,breadth of deformation zone,extent of deformation and velocity etc are gotten.The result indicates that fault-propagation fold plays most important role in the tectonic deformation of the terraces.The terrace deformation rates have been accelerated since the late Quaternary.
出处
《西北地震学报》
CSCD
北大核心
2012年第4期393-397,404,共6页
Northwestern Seismological Journal
基金
中国地震局地震预测研究所基本科研业务专项(2011IESLZ01)
中国地震局兰州地震研究所论著号:LC2012025
关键词
河流阶地
差分GPS测量
构造变形
断裂扩展褶皱
庄浪河
Fluvial terrace
Differential GPS surveying
Tectonic deformation
Fault-propagation fold
Zhuanglang river
