利用GPS资料求解中国大陆应变场的新方法  

A NEW METHOD TO SOLVE STRAIN FIELD OF CHINA MAINLAND BY USING GPS DATA

作　　者：段维波[1] 吴云[1] 陈慧杰[1] 

机构地区：[1]中国地震局地震研究所,武汉430071

出　　处：《大地测量与地球动力学》2011年第B06期72-76,共5页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震研究所所长基金(IS201026031)

摘　　要：探讨利用边长变化方法解算区域应变场,并用该方法对1999—2001年中国大陆及周边区域网GPS测站边长变化量进行分析,给出了该期间的中国大陆应变率场变化。分析结果表明:对大范围、密集的GPS测站的边长变化量进行连续变形分析,既能揭示中国大陆地壳应变的总体分布,又能显示局部地区的构造获得。总体上,中国大陆构造的水平变形强度在南北地震带产生突变,呈现出西强东弱、南强北弱的态势。而昆仑山地块中部、鲜水河断裂带和云南中部地区,其应变速率最大。天山东部具有拉张环境。A new method for calculating strains based on side length changes is proposed. By use of this method tile strains distribution of Chinese mainland in the period of 1999 to 2001 are calculated. The results show that the analysis of the continuous deformation in the large-scale and dense GPS velocity field can reveal not only the integral tectonic characters of Chinese mainland but also the tectonic deformation which have a mutation in the South North Seismic Belt and is stronger in the west than in the east and stronger in the south than in the north. The largest strain rates are found in the areas as Kunlun block,Xianshuihe fault zone and central Yunnan,and the variation of velocity is very rapid,and extensive strain is found in the eastern part of Tianshan.

关 键 词：面应变 应变率 主应变 区域网 GPS 

分 类 号：P227[天文地球—大地测量学与测量工程] P315.726[天文地球—测绘科学与技术]