Acoustic fluidization and the scale dependence of impact crater morphology.

Details Acoustic fluidization and the scale dependence of impact crater morphology. Acoustic fluidization and the scale dependence of impact crater morphology.

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..830m&link_type=abstract

Journal of Geophysical Research, Vol. 88, Suppl., p. A830 - A834

Mathematics

Logic

4

Meteorite Craters:Morphology

Scientific paper

A phenomenological Bingham plastic model has previously been shown to provide an adequate description of the collapse of impact craters. This paper demonstrates that the Bingham parameters may be derived from a model in which acoustic energy generated during excavation fluidizes the rock debris surrounding the crater. Experimental support for the theoretical flow law is presented. The Bingham viscosity is derived from a simple argument which shows that it increases as the 3/2 power of crater diameter, consistent with observation. Crater collapse may occur in material with internal dissipation Q as low as 100, comparable to laboratory observations of dissipation in granular materials.

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