摘要
利用2009~2015年的GPS水平运动速度场数据,解算云南地区的地壳应变场,在红河断裂与曲江断裂选取两个GPS剖面,计算并分析两个断裂的应变积累特征。结果显示:1)红河、曲江、小江等多个主要断裂应变场存在张、压交替的时空演化特征,近期曲江断裂南段表现为东西向拉张,红河断裂北段东西向拉张量值较大,约12.0×10^(-8)/a,云南南部主要表现为NNE向的压性变化;2)从GPS剖面看,红河、曲江断裂在两个方向上均显示右旋走滑与拉张的变化特征,从量值上看,红河断裂北段运动速率较大,约8.90mm/a。
Based on 2009-2015 GPS velocity field data, the crustal strain field of Yunnan province is calculated and strain accumulation characteristics of two GPS stations selected at Honghe and Qujiang faults are analyzed. The results show that： （1） The Honghe, Qujiang, Xiaojiang main fracture strain fields contain tension and compression about time and space evolution characteristics. Recently, the south section of the Qujiang fault presents tension east-west. The northern section of the Honghe fault extension is larger, about 12.0× 10^-8/a, and the main performance of the southern Yunnan is pressure changes in NNE. （2） From the GPS profile, the Honghe, Qujiang faults show dextral strike slip and extensional variation in the two directions. However, from the value, the movement rate is larger in the north of the Honghe fault, where the strike slip rate is about 8.90 mm/a.
出处
《大地测量与地球动力学》
CSCD
北大核心
2018年第2期125-128,共4页
Journal of Geodesy and Geodynamics
基金
川滇国家地震监测预报实验场项目(2016CESE0202)
中国地震局青年震情跟踪课题(2017010233).
关键词
GPS速度场
断裂
应变场
应力积累
GPS velocity fields
fault
strain field
strain accumulation
