DOI: 10.1038/ngeo2130
论文题名: Eastward expansion of the Tibetan Plateau by crustal flow and strain partitioning across faults
作者: Liu Q.Y. ; Van Der Hilst R.D. ; Li Y. ; Yao H.J. ; Chen J.H. ; Guo B. ; Qi S.H. ; Wang J. ; Huang H. ; Li S.C.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 5 起始页码: 361
结束页码: 365
语种: 英语
Scopus关键词: crustal movement
; deformation
; fault
; regional climate
; seismic data
; seismograph
; China
; Qinghai-Xizang Plateau
英文摘要: The lateral expansion of the southeastern Tibetan Plateau causes devastating earthquakes, but is poorly understood. In particular, the links between regional variations in surface motion and the deeper structure of the plateau are unclear. The plateau may deform either by movement of rigid crustal blocks along large strike-slip faults, by continuous deformation, or by the eastward flow of a channel of viscous crustal rocks. However, the importance of crustal channel flow was questioned in the wake of the 2008 Wenchuan earthquake. Controversies about the style of deformation have persisted, in part because geophysical probes have insufficient resolution to link structures in the deep crust to the observed surface deformation. Here we use seismic data recorded with an array of about 300 seismographs in western Sichuan, China, to image the structure of the eastern Tibetan Plateau with unprecedented clarity. We identify zones of weak rocks in the deep crust that thicken eastwards towards the Yangtze Craton, which we interpret as crustal flow channels. We also identify stark contrasts in the structure and rheology of the crust across large faults. Combined with geodetic data, the inferred crustal heterogeneity indicates that plateau expansion is accommodated by a combination of local crustal flow and strain partitioning across deep faults. We conclude that rigid block motion and crustal flow are therefore not irreconcilable modes of crustal deformation. © 2014 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106503
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: State Key Laboratory of Earthquake Dynamics, Institute of Geology, CEA, Beijing 100029, China; Department of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, MA 02139, United States; Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, USTC, Hefei, Anhui 230026, China
Recommended Citation:
Liu Q.Y.,Van Der Hilst R.D.,Li Y.,et al. Eastward expansion of the Tibetan Plateau by crustal flow and strain partitioning across faults[J]. Nature Geoscience,2014-01-01,7(5)