Physics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13...14k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, Jan. 1986, p. 14-17. Previously announced in STAR as N85-35845.
Physics
71
Earth Mantle, Geoids, Gravitational Fields, Gravity Anomalies, Planetary Gravitation, Plates (Tectonics), Plumes, Subduction (Geology), Tectonics, Venus (Planet), Earth Gravitation, Planetary Environments, Solar System, Terrestrial Planets, Venus, Gravity Fields, Dynamics, Models, Anomalies, Topography, Isostacy, Mantle, Convection, Flow, Viscosity, Layers, Comparisons, Tectonism, Heat, Transport, Hot Spots, Plumes, Calculations
Scientific paper
Unlike Earth, long wavelength gravity anomalies and topography correlate well on Venus. Venus's admittance curve from spherical harmonic degree 2 to 18 is inconsistent with either Airy or Pratt isostasy, but is consistent with dynamic support from mantle convection. A model using whole mantle flow and a high viscosity near surface layer overlying a constant viscosity mantle reproduces this admittance curve. On Earth, the effective viscosity deduced from geoid modeling increases by a factor of 300 from the asthenosphere to the lower mantle. These viscosity estimates may be biased by the neglect of lateral variations in mantle viscosity associated with hot plumes and cold subducted slabs. The different effective viscosity profiles for Earth and Venus may reflect their convective styles, with tectonism and mantle heat transport dominated by hot plumes on Venus and by subducted slabs on Earth. Convection at degree 2 appears much stronger on Earth than on Venus. A degree 2 convective structure may be unstable on Venus, but may have been stabilized on Earth by the insulating effects of the Pangean supercontinental assemblage.
Bills Bruce G.
Hager Bradford H.
Kiefer Walter Scott
Richards Anita M.
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