Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..364v&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 364-365 (SEE N92-10728 01-91)
Physics
Geophysics
Computer Programs, Cratering, Dunite, Ejecta, Equations Of State, Hypervelocity Impact, Impact Melts, Mathematical Models, Projectiles, Computerized Simulation, Earth (Planet), Geomorphology, Magma, Moon, Pressure Distribution, Shock Waves, Turbidity, Venus (Planet)
Scientific paper
Impact craters imaged by Magellan clearly show large amounts of flow-like ejecta whose morphology suggests that the flows comprise low-viscosity material. It was suggested that this material may be either turbidity flows or very fine-grained ejecta, flows of ejecta plus magma, or impact melts. The last of these hypotheses is considered. If these flows are composed of impact melts, there is much more melt relative to the crater volume than is observed on the moon. The ANEOS equation of state program was used for dunite to estimate the shock pressures required for melting, with initial conditions appropriate for Venus, Earth, and the moon. A simple model was then developed, based on the Z-model for excavation flow and on crater scaling relations that allow to estimate the ratio of melt ejecta to total ejecta as a function of crater size on the three bodies.
Melosh Henry Jay
Vickery Ann M.
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