globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116891
论文题名:
Layered crustal azimuthal anisotropy beneath the northeastern Tibetan Plateau revealed by Rayleigh-wave Eikonal tomography
作者: Hao S.; Huang Z.; Han C.; Wang L.; Xu M.; Mi N.; Yu D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 563
语种: 英语
中文关键词: azimuthal anisotropy ; crustal flow ; Eikonal tomography ; plateau expansion ; pure shear ; Tibetan Plateau
英文关键词: Anisotropy ; Rayleigh waves ; Shear flow ; Shear waves ; Strike-slip faults ; Tomography ; Wave propagation ; Azimuthal anisotropy ; Crustal flow ; Crustals ; Eikonal ; Eikonal tomography ; Northeastern tibetan plateaux ; Plateau expansion ; Pure shear ; Rayleigh ; Tibetan Plateau ; Expansion ; crustal deformation ; phase velocity ; plateau ; Rayleigh wave ; S-wave ; seismic anisotropy ; seismic tomography ; tectonic evolution ; China ; Qinghai-Xizang Plateau
英文摘要: The uplift of the Tibetan Plateau in the Cenozoic has greatly affected the tectonics in Asia. But the evolution of the plateau is still unclear. The northeastern Tibetan Plateau is under ongoing expansion and is therefore essential for understanding the tectonic evolution of the plateau. Using data from 675 stations deployed by the ChinArray project, we obtained an anisotropic shear-wave velocity model by Rayleigh-wave phase-velocity Eikonal tomography and further investigated layered anisotropy and deformation patterns in the northeastern Tibetan Plateau. In the upper crust (<20 km depth), the fast directions are parallel with major strike-slip faults. In the lower crust, the fast directions are mostly margin-parallel along the plateau margin (at depths of ∼20 km to Moho), but they are perpendicular to the plateau margin while parallel to the topographic gradient under the high plateau (at depths of ∼40 km to Moho). Our result indicates that there is lower crustal flow under the high plateau due to the differential lateral gravity potential. However, the deep crustal flow is blocked by the surrounding blocks, which results in pure shear along the plateau margin in the northeastern Tibetan Plateau. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165496
Appears in Collections:气候变化与战略

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作者单位: State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China

Recommended Citation:
Hao S.,Huang Z.,Han C.,et al. Layered crustal azimuthal anisotropy beneath the northeastern Tibetan Plateau revealed by Rayleigh-wave Eikonal tomography[J]. Earth and Planetary Science Letters,2021-01-01,563
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