用GPS资料分析青藏高原现今应变率场  

Present-Day Strain Rate Field of Tibetan Plateau Analyzed by GPS Measurements

作　　者：王伟[1] 王迪晋[1] 陈正松[1] 乔学军[1] 

机构地区：[1]中国地震局地震研究所(地震大地测量重点实验室),武汉市430071

出　　处：《大地测量与地球动力学》2017年第9期881-883,897,共4页Journal of Geodesy and Geodynamics

基　　金：国家国际科技合作专项(2015DFA21260);国家自然科学基金(41404015,41304067,41474097);中国地震局地震研究所所长基金(IS201326119)~~

摘　　要：基于中国大陆构造环境监测网络的GPS观测资料,获取青藏高原及周边地区地壳水平运动速度场以及应变率场。结果表明,青藏高原及周边地区10a尺度应变率场分布的整体特征与该地区长期地质构造背景和地震活动具有继承性,主应变、剪应变以及面膨胀率的分布特征与高原边缘和天山地区的地壳缩短、藏中南地壳的东西向伸展以及高原内部走滑断裂的构造活动一致。Based on GPS measurements from crustal movement observation network of China, we de- rive the crustal movement velocity field and strain rate for the Tibetan plateau and its surrounding are- as. Preliminary analysis indicates that the distribution of current strain rate across the Tibetan plateau is consistent with long-term tectonic settings and its earthquake activities. The principal compressive strain rate, maximum shear rate and the dilation rate are in good agreement with the crustal shorten- ing across the margin of the Tibetan plateau and the Tianshan, the approximately west-east extension in southern Tibet, and the strike slip faults in the Tibetan plateau, indicating that the strain field derived from decade-long GPS observations is compatible with long-term active settings and earthquake activities in the Tibetan plateau.

关 键 词：青藏高原 GPS 地壳运动 应变率 

分 类 号：P315[天文地球—地震学]