亚东-谷露裂谷带与块体运动的特征  

CHARACTERISTICS OF CRUST DEFORMATION IN YADONG-GULU RIFT AND ITS SURROUNDING AREAS WITH GPS DATA

作　　者：喻成[1] 乔学军[1,2] 王伟[1,2] 史永明[3] 

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430071 [2]中国地震局地壳应力研究所武汉科技创新基地,武汉430071 [3]中国地震局第一监测中心,天津300180

出　　处：《大地测量与地球动力学》2014年第2期36-40,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41274027)

摘　　要：利用2009～2011年的GPS水平速度场,采用负位错模型,研究了亚东-谷露裂谷带及邻区的断层运动速率、闭锁程度及其构造运动特征。结果表明,相对于西南块体,东南、东北及西北各块体的欧拉极分别为（89.37°,27.91°,-2.56°/Ma）、（89.02°,28.94°,-2.87°/Ma）、（85.03°,27.98°,-0.93°/Ma）。雅鲁藏布缝合线南北侧测站的差异运动表明其为走滑断层,左侧右旋速率为4.5 mm/a,右侧为2.2 mm/a。计算结果表明,亚东-谷露裂谷带南段的拉张速率约为6.75±0.9 mm/a,北段的拉张速率为4.72±0.8 mm/a,均高于地质研究获得的长期运动速率。反演结果显示,亚东-谷露裂谷带闭锁深度为10 km,小于一般断层的闭锁深度。Characteristics of crust motion,locking ratio and fault activity of the study area were analized based on a negative dislocation with horizontal GPS velocity data from 2009 to 2011. The study area is divided into 4blocks by Yadong-Gulu rift and Yarlung-Zangbo Suture. Taking the Southwest Block as a reference point,Euler pole（ EP） of Southeast Block is 89. 37°,27. 91°,-2. 56°/Ma,EP of Northeast Block is 89. 02°,28. 94°,-2. 87°/Ma,and EP of Northwest Block is 85. 03°,27. 98°,- 0. 93° / ma. Difference of velocity between sites in the north side of Yarlung-Zangbo Suture and the sites in the south side of Yarlung-Zangbo Suture indicates that the Suture is a strikeslip fault with a rate of 6. 75 ± 0. 9 mm / a in the southern section,and 4. 72 ± 0. 8 mm / a in the narthern section both of them are larger than that from geological observation. According to the inversion result,the locking depth of Yadong-Gulu rift is 10 km,less than most faults.

关 键 词：亚东-谷露裂谷带 负位错反演 雅鲁藏布缝合线 青藏高原 GPS 

分 类 号：P315.726[天文地球—地震学]