Mathematics – Logic
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..985m&link_type=abstract
Geophysical Research Letters, vol. 5, Nov. 1978, p. 985-988.
Mathematics
Logic
31
Gravitational Effects, Lunar Craters, Ring Structures, Structural Basins, Geological Faults, Lunar Evolution, Plastic Flow, Selenology, Basins, Formation Of, Rings, Moon, Artificial Impacts, Scarps, Origin, Models, Deformation, Radius, Flow, Stratification, Depths, Gravity, Waves
Scientific paper
The study investigates the mechanics of ring formation in lunar basins by collapse or slumping. Two classes of models are presented in order to broaden the range of plausible mechanisms involved. Extrusion flow models which assume a weak layer underlying a strong layer as well as plastic flow models which assume a continuous decrease of cohesion strength with depth are considered. In both classes, strength or resistance to deformation decreases with depth. If this decrease is rapid enough, in either set of models, at least one concentric fault scarp forms. The ratio between the scarp radius and the crater radius varies between 1.2 and about 2.7 depending on the model, and is thus in the range of observed radius ratios.
McKinnon William B.
Melosh Henry Jay
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