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Generation of long wavelength heterogeneity in the mantle by the dynamic interaction between plates and convection

Gurnis, Michael and Zhong, Shijie (1991) Generation of long wavelength heterogeneity in the mantle by the dynamic interaction between plates and convection. Geophysical Research Letters, 18 (4). pp. 581-584. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20130312-083054132

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Abstract

Lateral variations in seismic velocity (through its dependence on temperature) can easily be generated at the gravest harmonics, including degrees one and two, by the dynamic interaction between plates and convection. Models of thermal convection with a single non-subducting plate have been formulated in a cylindrical geometry. Plates of width one to four times times the thickness of the convecting region strongly modulate the flow by being pushed over cold downwellings and inhibiting cooling of the fluid beneath. During rapid motion off of hot regions, a large-scale pattern of shear is developed causing small uprising limbs to be swept into the largest upwellings. Both insulation and plume-plume collisions pump energy into the lower wavenumber harmonics.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/91GL00823 DOIUNSPECIFIED
http://onlinelibrary.wiley.com/doi/10.1029/91GL00823/abstractPublisherUNSPECIFIED
Additional Information:© 1991 by the American Geophysical Union. Funded by NSF grants EAR-8957164 and EAR-8904660.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-8957164
NSFEAR-8904660
Record Number:CaltechAUTHORS:20130312-083054132
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130312-083054132
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37455
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Mar 2013 20:18
Last Modified:11 Jun 2015 12:59

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