Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL085721 |
Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy | |
Bao, Xuewei1; Song, Xiaodong2,3; Eaton, David W.4; Xu, Yixian1; Chen, Hanlin1 | |
2020-02-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA; Canada |
英文摘要 | Mechanisms for uplift and deformation of the Tibetan Plateau remain vigorously debated; hypotheses include stepwise growth, distributed thickening, and crustal channel flow, each with a distinct anisotropic signature. We have developed a new azimuthally anisotropic shear velocity model for the lithosphere beneath eastern Tibet, based on ambient noise tomography from 643 seismic stations. In our model, the Tibetan upper crust is characterized by strong anisotropy with fast axes that correlate with surface geology and mantle anisotropy, suggesting the occurrence of coherent deformation. However, a much different picture emerges in the middle and lower crust, where anisotropy is disordered and weaker beneath the plateau than along its margins, inconsistent with the prediction of large-scale eastward crust flow in eastern Tibet. Our observations are best explained by heterogeneous crustal thickening beneath the plateau with complex flow in the middle and lower crust, accompanied by asthenospheric upwelling along the southeastern plateau margin. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529107400038 |
WOS关键词 | WENCHUAN EARTHQUAKE ; TECTONIC EVOLUTION ; RELIEF GENERATION ; JOINT INVERSION ; AMBIENT NOISE ; PLATEAU ; BENEATH ; MARGIN ; CRUST ; FLOW |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279580 |
专题 | 气候变化 |
作者单位 | 1.Zhejiang Univ, Sch Earth Sci, Hangzhou, Peoples R China; 2.Peking Univ, Sch Earth & Space Sci, Inst Theoret & Appl Geophys, Beijing, Peoples R China; 3.Univ Illinois, Dept Geol, Urbana, IL 61801 USA; 4.Univ Calgary, Dept Geosci, Calgary, AB, Canada |
推荐引用方式 GB/T 7714 | Bao, Xuewei,Song, Xiaodong,Eaton, David W.,et al. Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(3). |
APA | Bao, Xuewei,Song, Xiaodong,Eaton, David W.,Xu, Yixian,&Chen, Hanlin.(2020).Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy.GEOPHYSICAL RESEARCH LETTERS,47(3). |
MLA | Bao, Xuewei,et al."Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy".GEOPHYSICAL RESEARCH LETTERS 47.3(2020). |
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