Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..152g&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 152-153 (SEE N92-10728 01-91)
Physics
Geophysics
Cratering, Craters, Earth (Planet), Evolution (Development), Aeolian Tones, Aerial Photography, Drainage, Ejecta, Rims, Satellite Imagery
Scientific paper
From these three craters, a first order gradational evolutionary sequence can be proposed. As crater rims are reduced by backwasting and downwasting through fluvial and mass wasting processes, craters are enlarged by approx. 10 pct. Enlargement of drainages inside the crater eventually forms rim breaches, thereby capturing headward portions of exterior drainages. At the same time, the relative importance of gradational processes may reverse on the ejecta: aeolian activity may supersede fluvial incisement and fan formation at late stages of modification. Despite actual high drainage densities on the crater exterior during early stages of gradation, the subtle scale of these systems results in low density estimates from air photos and satellite images. Because signatures developed on surfaces around all three craters appear to be mostly gradient dependent, they may not be unique to simple crater morphologies. Similar signatures may develop on portions of complex craters as well; however, important differences may also occur.
Grant Alex J.
Schultz Peter H.
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