Statistics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept..192p&link_type=abstract
In NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984 p 192-194 (SEE N85-23474 13-91)
Statistics
Concentric Spheres, Cratering, Craters, Geomorphology, Planetary Geology, Structural Basins, Velocity Distribution, Planetary Surfaces, Rock Mechanics, Structural Properties (Geology)
Scientific paper
The spacing of the concentric rings of planetary impact basins was studied. It is shown that a radial increment of x 0.5 D, where x is about 2.0 and D = ring diameter, separates both (1) adjacent least-squares groups of rings and arcs of multi-ring basins on Mars, Mercury, and the Moon; and (2) adjacent rings of individual basins on the three planets. Statistics for ratios of ring diameters are presented, the first and most-applied parameter of ring spacing. It is found that ratios excluding rings flanking the main ring also have a mean spacing increment of about 2.0. Ratios including such rings, as for the least-squares groups, and (1) above, have a larger increment, averaging 2.1. The F-test indicates, that these spacings of basin ring locations, and mode of ring formation are controlled by the mechanics of the impact event itself, rather than by crustal properties.
Pike Richard J.
Spudis Paul D.
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