Physics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.2409k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Dec. 1990, p. 2409-2412.
Physics
62
Lithosphere, Newtonian Fluids, Plates (Tectonics), Subduction (Geology), Earth Mantle, Rheology, Slabs
Scientific paper
The relationship between oceanic trench viscosity and oceanic plate velocity is studied using a Newtonian rheology by varying the viscosity at the trench. The plate velocity is a function of the trench viscosity for fixed Rayleigh number and plate/slab viscosity. Slab velocities for non-Newtonian rheology calculations are significantly different from slab velocities from Newtonian rheology calculations at the same effective Rayleigh number. Both models give reasonable strain rates for the slab when compared with estimates of seismic strain rate. Non-Newtonian rheology eliminates the need for imposed weak zones and provides a self-consistent fluid dynamical mechanism for subduction in numerical convection models.
Hager Bradford H.
King Scott D.
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