Vertical crustal motions across Eastern Tibet revealed by topography-dependent seismic tomography

Abstract Using a topography-dependent tomographic scheme, the seismic velocity structure of the Eastern Tibetan Plateau, including the uplifted Longmenshan (LMS) orogenic belt, is accurately imaged in spite of the extreme topographic relief in the LMS region and thick sedimentary covers in the neigh...

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Autores principales:	Xinyan Zhang, Yanghua Wang, Rui Gao, Tao Xu, Zhiming Bai, Xiaobo Tian, Qiusheng Li
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bbc1fcbf257040d785961580b76744ee
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spelling	oai:doaj.org-article:bbc1fcbf257040d785961580b76744ee2021-12-02T12:30:44ZVertical crustal motions across Eastern Tibet revealed by topography-dependent seismic tomography10.1038/s41598-017-03578-z2045-2322https://doaj.org/article/bbc1fcbf257040d785961580b76744ee2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03578-zhttps://doaj.org/toc/2045-2322Abstract Using a topography-dependent tomographic scheme, the seismic velocity structure of the Eastern Tibetan Plateau, including the uplifted Longmenshan (LMS) orogenic belt, is accurately imaged in spite of the extreme topographic relief in the LMS region and thick sedimentary covers in the neighbouring Sichuan Basin. The obtained image shows a high-resolution upper crustal structure on a 500 km-long profile that is perpendicular to the LMS. The image clearly shows that the crystalline basement was uplifted within the LMS orogenic belt, and that the neighbouring Songpan-Ganzi Terrane was covered by a thick flysch belt, with evidence of near-surface thrust faults caused by convergence between Eastern Tibet and the Sichuan Basin. The indication that the lower crust beneath the LMS was folded and pushed upwards and the upper crust was removed by exhumation, supports the concept of a lower crustal channel flow beneath Eastern Tibet. The image also reveals that the destructive Wenchuan earthquake of year 2008 occurred in the upper crust, directly at the structural discontinuity between Eastern Tibet Plateau and the Sichuan Basin.Xinyan ZhangYanghua WangRui GaoTao XuZhiming BaiXiaobo TianQiusheng LiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xinyan Zhang Yanghua Wang Rui Gao Tao Xu Zhiming Bai Xiaobo Tian Qiusheng Li Vertical crustal motions across Eastern Tibet revealed by topography-dependent seismic tomography
description	Abstract Using a topography-dependent tomographic scheme, the seismic velocity structure of the Eastern Tibetan Plateau, including the uplifted Longmenshan (LMS) orogenic belt, is accurately imaged in spite of the extreme topographic relief in the LMS region and thick sedimentary covers in the neighbouring Sichuan Basin. The obtained image shows a high-resolution upper crustal structure on a 500 km-long profile that is perpendicular to the LMS. The image clearly shows that the crystalline basement was uplifted within the LMS orogenic belt, and that the neighbouring Songpan-Ganzi Terrane was covered by a thick flysch belt, with evidence of near-surface thrust faults caused by convergence between Eastern Tibet and the Sichuan Basin. The indication that the lower crust beneath the LMS was folded and pushed upwards and the upper crust was removed by exhumation, supports the concept of a lower crustal channel flow beneath Eastern Tibet. The image also reveals that the destructive Wenchuan earthquake of year 2008 occurred in the upper crust, directly at the structural discontinuity between Eastern Tibet Plateau and the Sichuan Basin.
format	article
author	Xinyan Zhang Yanghua Wang Rui Gao Tao Xu Zhiming Bai Xiaobo Tian Qiusheng Li
author_facet	Xinyan Zhang Yanghua Wang Rui Gao Tao Xu Zhiming Bai Xiaobo Tian Qiusheng Li
author_sort	Xinyan Zhang
title	Vertical crustal motions across Eastern Tibet revealed by topography-dependent seismic tomography
title_short	Vertical crustal motions across Eastern Tibet revealed by topography-dependent seismic tomography
title_full	Vertical crustal motions across Eastern Tibet revealed by topography-dependent seismic tomography
title_fullStr	Vertical crustal motions across Eastern Tibet revealed by topography-dependent seismic tomography
title_full_unstemmed	Vertical crustal motions across Eastern Tibet revealed by topography-dependent seismic tomography
title_sort	vertical crustal motions across eastern tibet revealed by topography-dependent seismic tomography
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/bbc1fcbf257040d785961580b76744ee
work_keys_str_mv	AT xinyanzhang verticalcrustalmotionsacrosseasterntibetrevealedbytopographydependentseismictomography AT yanghuawang verticalcrustalmotionsacrosseasterntibetrevealedbytopographydependentseismictomography AT ruigao verticalcrustalmotionsacrosseasterntibetrevealedbytopographydependentseismictomography AT taoxu verticalcrustalmotionsacrosseasterntibetrevealedbytopographydependentseismictomography AT zhimingbai verticalcrustalmotionsacrosseasterntibetrevealedbytopographydependentseismictomography AT xiaobotian verticalcrustalmotionsacrosseasterntibetrevealedbytopographydependentseismictomography AT qiushengli verticalcrustalmotionsacrosseasterntibetrevealedbytopographydependentseismictomography
_version_	1718394357949661184

Vertical crustal motions across Eastern Tibet revealed by topography-dependent seismic tomography

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