Computer Science
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..131h&link_type=abstract
Meteoritics & Planetary Science, vol. 33, no. 1, pages 131-143.
Computer Science
3
Scientific paper
In recent years morphometric data for Venus and several outer planet satellites have been collected, so we now have observational data of complex craters formed in a large range of target properties. We present general inversion techniques that can utilize the morphometric data to quantitatively test various models of complex crater formation. The morphometric data we use in this paper are depth of a complex crater, the diameter at which the depth-diameter ratio changes, and onset diameters for central peaks, terraces, and peak rings. We tested the roles of impactor velocities and hydrostatic pressure versus crustal strength, and we tested the specific models of acoustic fluidization (Melosh, 1982) and non-proportional growth (Schultz, 1988). Neither the acoustic fluidization model nor the non-proportional growth in their published formulations are able to successfully reproduce the data. No dependence on impactor velocity is evident from our inversions. Most of the morphometric data is consistent with a linear dependence on the ratio of crustal strength to hydrostatic pressure on a planet, or the factor c/rg.
Herrick Robert R.
Lyons Suzanne N.
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