Distribution of craters of various age on Martian surface

Details Distribution of craters of various age on Martian surface Distribution of craters of various age on Martian surface

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rpspr...4...84r&link_type=abstract

In its USSR Rept.: Space (JPRS-USP-84-003) p 84 (SEE N84-28823 19-12) Transl. into ENGLISH from Astron. Vestn. (USSR), v. 17,

Other

Distribution (Property), Mars Craters, Mars Surface, Aging (Materials), Albedo, Classifications, Hypsometers, Maps

Scientific paper

Using published maps of the Martian surface a study was made of the four groups of craters according to age, using as a base albedo and hypsometric level. Of the 12,700 craters distinguished, 7% were assigned to the greatest age, 15% to ancient, 15% to new and 60% to very new. Craters were also categorized into four groups according to size. It was calculated that most craters assigned to the categories of greatest age, ancient and new lay within the 20-60-km range, while for the very new craters most were less than 20 km in diameter. Generally, the distribution of craters was found to be denser on dark areas and less dense on light areas, except for the Mare Acidalium which is dark but has a crater density of only 16 per 1 million square km. In studying crater distribution according to hypsometric level, a carbon dioxide pressure of 6.1 millibars was taken as a baseline; it was found that the highest crater density is at +3 to +4 kilometers and the lowest at -2 to 0 km. It is concluded that the ageing process takes place more rapidly in craters with diameters of 10-60 km in the lower fields remain for longer periods than craters in other categories, indicating two different ageing mechanisms.

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