Anisotropy of the Crust and Upper Mantle beneath the Central Tibetan Plateau

详细信息   

• 责任者：Zhang Zhi (Key Laboratory of Geological Engineering Centre of Guangxi ; College of Earth Sciences ; Guilin University of Technology ; Guilin 541004 ; China) ; Tian Xiaobo
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(11)
• 关键词：地壳 ; crust ; 上地幔 ; upper mantle ; 各向异性 ; anisotropy ; 青藏高原 ; Qinghai-Tibetan Plateau
• 页码：p.2761-2768
• 图表：6 illus., 38 refs.
• 分类号：0400
• 出版序号：20122237
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

This paper analyzes S-wave splitting analysis in terms of P-wave receiver functions and the SKS shear waves from the INDEPTH-III profile. The direction and extent of seismic polarization anisotropy in the crust and upper mantle beneath central Tibet were imaged.  In combination with previous geological and geophysical studies, the authors infer that the Lhasa crust possesses high rigidity and has not experienced rheological deformation, so that the fast direction of the anisotropy layer in the crust is consistent with the direction of the India-Eurasia convergence. However, the Qiangtang terrane is possibly weaker and more likely has been rheologically deformed during the convergence process, so that the fast direction of the anisotropy layer in the crust and upper mantle is coincident with escaping direction of material of the Tibetan Plateau.