Other
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7690r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 10, 1988, p. 7690-7708. Previously announced in STAR as N86-2506
Other
140
Anomalies, Fluid Mechanics, Geoids, Lithosphere, Mathematical Models, Spherical Harmonics, Volcanoes, Dynamic Response, Kinematics, Plates (Tectonics), Rheology, Temperature Dependence, Topography
Scientific paper
Hotspots are associated with long wavelength geoid highs, an association that is even stronger when the geoid highs associated with subduction zones are removed. These associations are quantified by expanding the hotspot distribution in spherical harmonics and calculating correlation coefficients as a function of harmonic degree. The hotspot distribution spectrum is essentially white, with peaks at degrees 2 and 6. It is correlated positively with the slab residual geoid for degrees 2 to 6, with low seismic velocity in the lower mantle at degree 2, and with low seismic velocity in the upper mantle at degree 6. A variety of fluid mechanical models were tested for hotspots, including lithospheric delamination and hot plumes, by calculating their predicted dynamic geoid responses and comparing them to the observations. These models include the effects of temperature dependent rheology. The preferred hotspot model, based on observations of the geoid and seismic tomography, has plumes preferentially occurring in regions of large scale background temperature highs in a mantle with substantial viscosity increase with depth, although other models are possible.
Hager Bradford H.
Richards Mark A.
Sleep Norman H.
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