Statistics – Applications
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgre..11610003r&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue E10, CiteID E10003
Statistics
Applications
Geochronology: Planetary And Lunar Geochronology, Planetary Sciences: Solid Surface Planets: Impact Phenomena, Cratering (6022, 8136), Planetary Sciences: Comets And Small Bodies: Surfaces, Planetary Sciences: Solar System Objects: Mars
Scientific paper
Crater statistics are used across a wide variety of applications on planetary surfaces, one of the most notable being estimating relative and absolute ages of those surfaces. This requires an assumed cratering rate over time and that craters be randomly distributed. Secondary craters - craters that form from the ejecta of an impact event - belie this assumption by creating greater crater density in a local area at a single time, significantly affecting crater statistics. There has been substantial debate over the relative importance of secondary craters, and our findings in this Mars study indicate that these events can be very significant and cannot be ignored when age-dating surfaces. We have analyzed secondary crater fields found close to 24 primary craters on Mars. Among other findings such as terrain control over secondary crater field characteristics, we conclude that a single large impact event (>100 km) can significantly affect crater statistics at the ˜1-5-km-diameter level over a non-trivial fraction of a planetary surface (minimum secondary crater diameters examined were ˜0.9 km; the minimum primary crater diameter was ˜20 km). We also suggest a potential way to avoid significant contamination by the majority of secondary craters that occur close to the primary impact event without the need to manually classify every crater as primary or secondary. Our findings are specific to Mars, but further work may show the patterns are applicable to other solid bodies.
Hynek Brian Michael
Robbins Stuart J.
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