Relative motion across the eastern Tibetan plateau: Contributions from faulting, internal strain and rotation rates
Relative motion across the eastern Tibetan plateau: Contributions from faulting, internal strain and rotation rates
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青藏高原东部的相对运动：断层、内应变和旋转速率的贡献
DOI：
10.1016/j.tecto.2012.08.006
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发表时间：
2013-01
期刊：
影响因子：
2.9
通讯作者：
张培震
中科院分区：
文献类型：
--
作者：
张竹琪;Robert McCaffrey;张培震
本文用一个由14个旋转弹塑性块体组成的运动学模型来描述藏东及邻区的现代变形。块旋转，断层滑动速率和永久应变速率块内的约束反演GPS速度，从地震中得到的滑动矢量方位角，和断层滑动速率来自地质。计算得到的藏东地块的内部应变速率为10 ~ 30×10−9/yr，而相邻地块（包括华南、阿拉善和泰国地块）的内部应变速率相对较低（<5×10−9/yr）。F检验统计结果表明，在描述藏东地区地表形变时，块体内部应变率和块体自旋都不能忽略。此外，滑动的主要故障验证了使用变形块体也可以预测应变定位和走向平行的变化，滑动速率。就青藏高原东部相对于欧亚板块的东-东南运动而言，块体内部应变率贡献的净相对速度约为10 mm/yr，约为断裂作用贡献的净相对速度的一半。在高原南北向缩短方面，95°E以西的内部应变增加到一阶因子，约为10 mm/yr，是断裂作用的近2倍。藏东地区的运动学研究表明，北西-南东向的剪切作用和南北向的挤压作用分别由主要断裂的断裂作用和分布的收缩作用所承担。
A kinematic model comprising 14 rotating, elastic–plastic blocks is used to represent the modern deformation of eastern Tibet and neighboring regions. Block rotations, fault slip rates and permanent strain rates within the blocks are constrained by inverting GPS velocities, slip vector azimuths derived from earthquakes, and fault slip rates derived from geology. The calculated internal strain rates of blocks in eastern Tibet amounts to 10 to 30×10−9/yr, in contrast to relatively low rates (<5×10−9/yr) in adjacent blocks including the south China, Alxa and Thailand blocks. F-test statistics show that neither the internal strain rates nor the spins of the blocks can be neglected in describing the surface deformation of eastern Tibet. Furthermore, slip on the main faults verifies that the use of deformable blocks can also predict strain localization and strike-parallel variations in slip rates. In terms of east–southeast motion of the eastern Tibetan plateau relative to the Eurasian plate, the net relative velocity contributed by internal strain rates in the blocks amounts to ~10mm/yr, about half of that due to the faulting. In terms of N–S shortening of plateau, however, the internal strain rises to a first order factor west of 95°E, contributing approximately 10mm/yr, nearly two times larger than that from faulting. The kinematics in eastern Tibet shows that different types of deformation, i.e., NW–SE shear and N–S compression, are taken up by faulting on major faults and distributed contraction, respectively.
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影响因子：
2.8
作者：
R. Mccaffrey;A. Qamar;R. King;R. Wells;G. Khazaradze;C. Williams;C. Stevens;J. Vollick;P. Zwi
通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
A. Socquet;C. Vigny;N. Chamot‐Rooke;W. Simons;C. Rangin;B. Ambrosius
影响因子：
4.2
作者：
Peizhen Zhang;P. Molnar;Xi-wei Xu
通讯作者：
Peizhen Zhang;P. Molnar;Xi-wei Xu
DOI：
--
发表时间：
2006
期刊：
Journal of Mineralogy and Petrology
影响因子：
--
作者：
Li Yong;Li Xiao-gang
通讯作者：
Li Yong;Li Xiao-gang