Physics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9311911g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Oct. 10, 1988, p. 11911-11929.
Physics
91
Hypervelocity Impact, Planetary Craters, Venus Surface, Viscosity, High Temperature Environments, Impact Damage, Relaxation (Mechanics), Surface Temperature, Temperature Gradients
Scientific paper
The authors employ the observed depths of impact craters to test models for the viscous relaxation of surface topography on Venus. They utilize a general numerical formulation of gravity-driven flow in a linearly viscous fluid and incorporate distinct densities and temperature-dependent flows laws for crustal and mantle material. Given an estimate for the initial topography of impact craters on Venus, the authors compare the observed topography with that predicted by viscous relaxation for a range of possible values for crater age, crater diameter, crustal thickness, and mean lithospheric thermal gradient. The calculations suggest that the mean thickness of the crust over a substantial fraction of the planet is probably about 10 - 20 km. The authors consider several possible implications of this result for the evolution of Venus.
Grimm Robert E.
Solomon Sean C.
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