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Geology and topography of Ra Patera, Io, in the Voyager era: Prelude to eruption

1997; American Geophysical Union; Volume: 24; Issue: 20 Linguagem: Inglês

10.1029/97gl02688

ISSN

1944-8007

Autores

P. Schenk, A. S. McEwen, A. G. Davies, Trevor Davenport, Kevin B. Jones, Brain Fessler,

Tópico(s)

Geology and Paleoclimatology Research

Resumo

Voyager era stereo images are used to map the geology and topography of Ra Patera (a major active volcanic center and possible site of sulfur eruptions on Io). The summit of Ra Patera reaches only ∼1 km above the surrounding plains. Pre‐Voyager‐era lava flows occur on slopes of 0.1–0.3°, comparable to the lunar mare. These flows were emplaced at either low viscosities, high eruption rates, or both. A 600‐km‐long ridged mountain unit (rising to ∼8 km near Carancho Patera) forms a 60 by 90 km wide plateau ∼0.5 km high 50 km east of Ra Patera. The new lava flows observed by Galileo flowed around the southern edge of this plateau.

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