摘要
联合GPS与重力数据,反演给出了川滇地区（96°-106°E,20°-36°N）的活动块体运动速度和主要活动断裂的错动速率。受青藏块体的北东向推挤和青藏高原隆升引起的重力势能作用,川滇地区围绕着喜马拉雅东构造作顺时针旋转运动,造成川滇地区东侧断裂作左旋走滑运动,而西侧断裂以右旋走滑为主。鲜水河-夏宁河-则木河-小江断裂是区内最活跃的断裂带,其左旋走滑速率分别为12.1±0.6 mm/a,9.0±1.2mm/a,6.4±1.0 mm/a,6.0±1.2 mm/a和8.3±0.5 mm/a。龙行山断裂具有2.6±1.1 mm/a的右旋走滑和1.3±1.2 mm/a的挤压速率。反演结果表明,区内的地壳运动模式更趋向于“连续变形”假说。
High precision GPS horizontal velocities and gravity data were used to estimate the crustal motion and fault slip rate in Sichuan-Yunnan region （96°-106° E, 20°-36°N）. Due to the influence of India-Tibet block＇s east-northward extrusion, and the gravitational buoyancy force associated with the sharp topographic gradient across the region, the first-order features of crustal deformation are the prominent clockwise rotation around East Himalaya Syntax （EHS）, and leads left-slip motion along the Xianshuihe-Xiaojiang fault system （east boundary） and right-slip motion along the Jinshajiang-Honghe fault system （west bounda- ry）. The Xianshuihe-Anninghe-Zemuhe- Xaiojiang fault system is the most active left-lateral fault in the region, with a rate of 12.1±0.6 mm/a, 9.0±1.2 mm/a, 6.44±1.0 mm/a, 6.0±1.2 mm/a and 9.0±1.2 mm/a respectively. The Longmenshan fault system is with a rate of 2.6±1.1 mm/a right-lateral slip, and 1.3±1.2 mm/a extrude. As a result, the pattern of crustal deformation in the region supports the continuous deformation hypothesis.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2009年第5期568-572,共5页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金资助项目(40574006
40874003
40721001)
国家公益(地震)行业科研专项基金资助项目(200808080)
地球空间环境与大地测量教育部重点实验室开放研究基金资助项目(07-11)
高等学校学科创新引智计划资助项目(B07037)
国家863计划资助项目(2009AA12Z317)
关键词
川滇地区
GPS
重力
联合反演
块体运动
活动断裂
Sichuan-Yunnan region
GPS
gravity
joint inversion
block motion
active fault
