青藏高原东缘地应变空间分布特征分析  

ANALYSIS OF SPATIAL DISTRIBUTION OF STRAIN AT EASTERN MARGIN OF TIBETAN PLATEAU

作　　者：吕志鹏[1] 伍吉仓[1] 孟国杰[2] 乔学军[3] 徐克科[1,4] 

机构地区：[1]同济大学测绘与地理信息学院,上海200092 [2]中国地震局地震预测研究所,北京100036 [3]中国地震局地震研究所(地震大地测量重点实验室),武汉430071 [4]河南理工大学测绘与国土信息工程学院,焦作454000

出　　处：《大地测量与地球动力学》2014年第1期19-23,共5页Journal of Geodesy and Geodynamics

基　　金：中美国际合作项目(2010DFB20190);国家自然科学基金(41074019;41274027)

摘　　要：采用"中国大陆构造环境监测网络"2009—2011年GPS监测站点的速度场结果,利用三角形法计算了青藏高原东缘的应变场,并对计算结果进行三角形形状因子检验和应变显著性检验。根据块体应变变化特性将其分为块体内部、块体边缘和块体边界三个典型区域。对各区域应变结果的分析表明:青藏高原东缘的龙门山断裂带成为区域内应变的高值区,反映自汶川Ms8.0地震之后出现了地壳松弛与大区域形变的调整。鲜水河断裂仍然是区域内应变较大的地区。Current strain field in the eastern margin of the Tibetan Plateau was calculated with the triangle methodthe triangle method using observation data of the Continental Tectonic Environmental Monitoring Network of China during the period of 2009-2011, and calculated results were tested with Triangular shape factor and strain significance. The observation region is divided into interior, edge and boundary according to the obtained strain characteristics. Longmenshan fault zone of the eastern margin of the Tibetan Plateau has become a district wiyh high values of strain after Ms8.0 Wenchuan earthquake, which reflects the block relaxation and deformation adjustment after the earthquake. Xianshuihe fault is still a district with largest strain, and it＇ s very important to monitor it con- tinuously.

关 键 词：GPS 青藏高原东缘 三角形法 地应变 中国大陆构造环境监测网络 

分 类 号：P315.726[天文地球—地震学]