基于GPS速度场的云南地壳应力积累特征分析  

Analysis of the Characteristics of Crustal Stress Accumulation in Yunnan Based on GPS Velocity Field

作　　者：唐红涛 贾鹏 刘芳 

机构地区：[1]中国地震局第一监测中心,西安市710054

出　　处：《大地测量与地球动力学》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).

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.

关 键 词：GPS速度场 断裂 应变场 应力积累 

分 类 号：P227[天文地球—大地测量学与测量工程] P312[天文地球—测绘科学与技术]