Three-dimensional instantaneous mantle flow induced by subduction

Details Three-dimensional instantaneous mantle flow induced by subduction Three-dimensional instantaneous mantle flow induced by subduction

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3308304p&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 8, CiteID L08304

Physics

33

Oceanography: General: Numerical Modeling (0545, 0560), Seismology: Mantle (1212, 1213, 8124), Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413)

Scientific paper

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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