Fast asthenosphere motion in high-resolution global mantle flow models

Journal article
(Original article)


Publication Details

Author(s): Weißmüller J, Gmeiner B, Ghelichkhan S, Huber M, John L, Wohlmuth BI, Rüde U, Bunge HP
Journal: Geophysical Research Letters
Publisher: American Geophysical Union (AGU)
Publication year: 2015
Volume: 42
Journal issue: 18
Pages range: 7429-7435
ISSN: 0094-8276
Language: English


Abstract


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.



FAU Authors / FAU Editors

Gmeiner, Björn Dr.-Ing.
Lehrstuhl für Informatik 10 (Systemsimulation)
Huber, Markus
Lehrstuhl für Informatik 10 (Systemsimulation)
Rüde, Ulrich Prof. Dr.
Lehrstuhl für Informatik 10 (Systemsimulation)


How to cite

APA:
Weißmüller, J., Gmeiner, B., Ghelichkhan, S., Huber, M., John, L., Wohlmuth, B.I.,... Bunge, H.-P. (2015). Fast asthenosphere motion in high-resolution global mantle flow models. Geophysical Research Letters, 42(18), 7429-7435. https://dx.doi.org/10.1002/2015GL063727

MLA:
Weißmüller, Jens, et al. "Fast asthenosphere motion in high-resolution global mantle flow models." Geophysical Research Letters 42.18 (2015): 7429-7435.

BibTeX: 

Last updated on 2018-19-04 at 03:26