Deep mantle viscous structure with prior estimate and satellite constraint

Details Deep mantle viscous structure with prior estimate and satellite constraint Deep mantle viscous structure with prior estimate and satellite constraint

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.4579i&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B3, p. 4579-4609.

Physics

40

Creep Properties, Earth Mantle, Earth Planetary Structure, Gravitational Fields, Viscosity, Convection, Geochronology, Glaciology, Oxygen 18, Rheology, Satellite Observation, Structural Properties (Geology), Temperature Profiles

Scientific paper

A radially stratified and incompressible earth model with secular variation of the second degree gravity field J-dot(2) is used here to test sensitivity of data to viscosity increases with depth and convective boundary layer structure. Prior estimates and observed nontidal J-dot(23)(-C-dot(20)) are consistent with a layered lower mantle viscosity. Details of this layering are examined by comparing predicted and observed J-dot(3), J-dot(4). Speculation that a high-velocity layer exists above D-double prime is considered. With a 650-km thick deep high-viscosity layer, the remaining lower mantle is in one of two ranges: 1.5 to 3.5 x 10 exp 20 or 3.5 to about 10 exp 22 Pa s.

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