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The relationship between plate velocity and trench viscosity in Newtonian and power-law subduction calculationsThe 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.
Document ID
19910036478
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
King, Scott D.
(California Institute of Technology Pasadena, United States)
Hager, Bradford H.
(MIT Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1990
Publication Information
Publication: Geophysical Research Letters
Volume: 17
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
91A21101
Funding Number(s)
CONTRACT_GRANT: NAG5-1132
CONTRACT_GRANT: NSF EAR-86-18744
Distribution Limits
Public
Copyright
Other

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