Subsidence of topography on Io |
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| Affiliation: | 1. CSIRO Energy Flagship, P.O. Box 52, North Ryde, NSW 1670, Australia;2. Research Institute of Unconventional Petroleum and Renewable Energy (RIUP&RE), China University of Petroleum (East China), Qingdao, Shandong, 266580, China;3. Faculty of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China |
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| Abstract: | Topographic features on Io tend to subside because their underlying roots are softened and eroded by contact with hot mantle. This can be offset by crustal thickening, due primarily to ongoing volcanism, but observations suggest that this is ≲1 cm year−1 at current topographic highs. Since crustal thinning occurs at ∼50 cm year−1 if the underlying material is a pure magma ocean, we conclude that Io has no global magma ocean. Viscosities in excess of ∼1010 P are implied for Io's interior. |
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