DOI: 10.1002/2015GL063727
论文题名: Fast asthenosphere motion in high-resolution global mantle flow models
作者: Weismüller J. ; Gmeiner B. ; Ghelichkhan S. ; Huber M. ; John L. ; Wohlmuth B. ; Rüde U. ; Bunge H.-P.
刊名: Geophysical Research Letters
ISSN: 0094-9374
EISSN: 1944-9105
出版年: 2015
卷: 42, 期: 18 起始页码: 7429
结束页码: 7435
语种: 英语
英文关键词: asthenosphere
; high-performance computing
; mantle convection
; rheology
Scopus关键词: Geodynamics
; Rheology
; asthenosphere
; High performance computing
; High resolution
; Mantle convection
; Orders of magnitude
; Upper-mantle velocities
; Varying thickness
; Viscosity contrast
; Velocity
; asthenosphere
; flow modeling
; magnitude
; mantle convection
; performance assessment
; rheology
; seismology
; tectonic evolution
英文摘要: A variety of geologic observations point to fast upper mantle flow that may exceed plate tectonic velocities by an order of magnitude. At the same time there is mounting evidence from seismology for flow-like structures in the upper 100-200 km of the mantle. Here we present a set of geodynamic simulations to link these observations. In a synthetic setting, we include asthenospheric channels of varying thickness, with an extreme case of 100 km, and a significant viscosity contrast of up to 4 orders of magnitude relative to the deeper mantle. Using our new global high-resolution code TERRA-NEO, we obtain an increase in velocity by a factor of 10 between a 1000 km thick and the very thin channel, translating into velocities of 20 cm/a within the narrow asthenosphere. We further present and verify a simple Poiseuille flow model, predicting that the upper mantle velocity scales with the inverse of the asthenosphere thickness. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945236934&doi=10.1002%2f2015GL063727&partnerID=40&md5=94b4f13d93ca9c9f769ea2c3e7854bac
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8989
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich, Germany
Recommended Citation:
Weismüller J.,Gmeiner B.,Ghelichkhan S.,et al. Fast asthenosphere motion in high-resolution global mantle flow models[J]. Geophysical Research Letters,2015-01-01,42(18).