Computer Science – Sound
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.3799c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. E2, p. 3799-3812
Computer Science
Sound
5
Geological Surveys, Lunar Evolution, Lunar Geology, Lunar Maps, Lunar Surface, Radar Maps, Structural Basins, Apollo Project, Basalt, Geological Faults, Lunar Craters, Radar Imagery, Stratigraphy, Moon, Procellarum, Oceanus, Origin, Formation, Grabens, Basins, Crust, Faulting, Spacecraft Observations, Apollo 17 Mission, Sounder Instrument, Hypotheses, Radar Methods, Procedure, Ringed Structure, Surface, Depth, Subsurface, Features, Impacts, Structure, Stratigraphy, Reflectivity, Thickness, History, Chronolo
Scientific paper
The Procellarum Basin is thought by some to be the result of a gargantuan impact that occurred very early in lunar history. It is suggested that later impacts such as Imbrium, would have partially obliterated the outline of that ancient 'Gargantuan' basin in most areas, leaving only its western margin with a circular shape. An alternative idea is that the Procellarum Basin is the result of faulting associated with the Imbrium event. A subsurface horizon in Oceanus Procellarum was detected using the Apollo lunar sounder experiment optical-format data. The horizon is deepest at the western edge of the basin, and shallows eastward. Peak ring structure was not observed in the areas where peak rings were predicted to exist according to the 'Gargantuan impact' hypothesis. This observation implies that the alternative (graben) formation hypothesis for Oceanus Procellarum may be more likely. Other geophysical and geologic evidence that supports the graben hypothesis is reviewed. Some new radar evidence of a 500-km-diamter pre-Imbrian impact basin beneath Mare Insularum, in the Copernicus region is reported.
Carter Luther J.
Cooper Lauren B.
Sapp Clyde A.
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