Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..983o&link_type=abstract
Lunar and Planetary Science, volume 27, page 983
Other
1
Craters, Craters: Complex, Peak: Central
Scientific paper
Previous theories/models explain the formation of complex craters. These include: 1) dynamic theories that assume rapid collapse of the transient crater, oscillation of the central peak, and the propagation and freezing of wave structures, to 2) quasi-static theories that assume material failure and slumping of the transient cavity walls, or viscous relaxation of the transient cavity. We numerically modeled the initial shock wave driven flow fields to the late-stage strength-and gravity-driven motions leading to iso-static equilibrium. Two (bounding) strength models can describe effects of deep regoliths to highly consolidated surfaces and give varying final crater depth, diameter and other features. Transition from simple to complex craters occurs for planetary strengths consistent with conventional strength models (e.g. ~10 kbs, at depth). In complex craters, the diameter of the inner ring corresponds to the diameter of the transient cavity. The calculated depth/diameter ratios for craters varies from 1/6 to 1/60, depending upon model strength and scaling regime.
Ahrens Thomas J.
O'Keefe John D.
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