气候变化领域集成服务门户(CCPortal): Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy

CCPortal

DOI	10.1029/2019GL085721
	Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy
	Bao X.; Song X.; Eaton D.W.; Xu Y.; Chen H.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
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. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Acoustic noise; Deformation; Seismology; Shear flow; Tomography; Ambient noise tomographies; Azimuthal anisotropy; Crustal thickenings; Lithospheric deformation; Seismic anisotropy; Shear velocity models; Strong anisotropy; Tibetan Plateau; Anisotropy; ambient noise; azimuth; channel flow; crustal deformation; crustal thickening; episodic event; heterogeneity; seismic anisotropy; tomography; China; Qinghai-Xizang Plateau
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170749
作者单位	School of Earth Sciences, Zhejiang University, Hangzhou, China; Institute of Theoretical and Applied Geophysics, School of Earth and Space Sciences, Peking University, Beijing, China; Department of Geology, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Department of Geoscience, University of Calgary, Calgary, AB, Canada
推荐引用方式 GB/T 7714	Bao X.,Song X.,Eaton D.W.,et al. Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy[J],2020,47(3).
APA	Bao X.,Song X.,Eaton D.W.,Xu Y.,&Chen H..(2020).Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy.Geophysical Research Letters,47(3).
MLA	Bao X.,et al."Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy".Geophysical Research Letters 47.3(2020).