Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...44..454m&link_type=abstract
(IAU, American Astronomical Society, COSPAR, University of Hawaii, and NASA, Colloquium on the Satellites of Jupiter, 5th, Kailu
Astronomy and Astrophysics
Astronomy
69
Callisto, Ganymede, Lithosphere, Planetary Evolution, Planetary Structure, Ring Structures, Geomorphology, Gravity Waves, Satellite-Borne Photography, Voyager 2 Spacecraft
Scientific paper
The thickness and viscosity of a planetary lithosphere increase with time as the mantle cools, with a thicker lithosphere leading to the formation of one (or very few) irregular normal faults concentric to the crater. Since a gravity wave or tsunami induced by impact into a liquid mantle would result in both radial and concentric extension features, which are not observed in the case of the large impact structures on Ganymede and Callisto, an alternative mechanism is proposed in which the varying ice/silicate ratios, techtonic histories, and erosional mechanisms of the two bodies are considered to explain the subtle differences in thin lithosphere ring morphology between Ganymede and Callisto. It is concluded that the present lithosphere thickness of Ganymede is too great to permit the development of any rings.
McKinnon William B.
Melosh Henry Jay
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