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Authors: Piromallo, C.* 
Becker, T. W.* 
Funiciello, F.* 
Faccenna, C.* 
Title: Three-dimensional instantaneous mantle flow induced by subduction
Issue Date: 2006
Series/Report no.: /33 (2006)
DOI: 10.1029/2005GL025390
Keywords: mantle flow
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.03. Mantle and Core dynamics 
Abstract: We conduct three-dimensional subduction experiments by a finite element approach to study flow around slabs, which are prescribed based on a transient stage of upper mantle subduction from a laboratory model. Instantaneous velocity field solutions are examined, focusing on the toroidal vs. poloidal components as a function of boundary conditions, plate width, and viscosity contrast between slab and mantle. We show how the slab-to-mantle viscosity ratio determines the strength of toroidal flow, and find that the toroidal flow component peaks for slab/mantle viscosity ratios ~100 independent of slab width or geometry.
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