Other
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7763s&link_type=abstract
Journal of Geophysical Research, vol. 87, Sept. 10, 1982, p. 7763-7771.
Other
30
Impact Damage, Planetary Geology, Structural Basins, Topography, Venus Surface, Relaxation (Mechanics), Surface Temperature, Viscosity
Scientific paper
The viscous relaxation with time of the topographic relief of impact basins on Venus is calculated under the assumption that the surface temperature of the planet has been at or near its presently high value since the time of basin formation. The effects of a decrease in effective viscosity with depth and of the partial to complete isostatic compensation of initial topography are included in the model. An impact basin several hundred kilometers or greater in diameter and three billion years old or older should have negligible topographic relief at present. On this basis, the hypothesis that quasi-circular features of low radar backscatter but little topographic relief may be relaxed remnants of ancient impact basins cannot be excluded. However, large quasi-circular depressions on Venus, such as Atlanta Planitia, are unlikely to be remnants of impact basins, because of their current relief, and so some other process should be found to account for them.
Head James W.
Solomon Stanley C.
Stephens Stuart Keller
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