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Subsidence of topography on IoThe underlying roots of Io's topographic features are softened and eroded by contact with the hot mantle, resulting in a subsidence which is analogous to the progress of a butter pat on a frying pan. This process would be offset by crustal thickening due to continuing volcanism if the rate for this phenomenon were more than the observed 1 cm/year or less. Because the crustal thinning would occur at about 50 cm/year if the material underneath were a pure magma ocean, Io cannot have a global magna ocean, and interior viscosities greater than about 10 to the 10th P are implied.
Document ID
19870057136
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Webb, Erik K.
(Brigham Young University Provo, UT, United States)
Stevenson, David J.
(Cornell University Ithaca, NY, United States)
Date Acquired
August 13, 2013
Publication Date
May 1, 1987
Publication Information
Publication: Icarus
Volume: 70
ISSN: 0019-1035
Subject Category
Lunar And Planetary Exploration
Accession Number
87A44410
Funding Number(s)
CONTRACT_GRANT: NAGW-185
Distribution Limits
Public
Copyright
Other

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