Topographic evidence for shield volcanism on Io

Details Topographic evidence for shield volcanism on Io Topographic evidence for shield volcanism on Io

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...67..181m&link_type=abstract

Icarus (ISSN 0019-1035), vol. 67, July 1986, p. 181-183.

Computer Science

16

Bedrock, Io, Planetary Geology, Satellite Surfaces, Topography, Volcanology, Basalt, Slopes, Voyager 1 Spacecraft

Scientific paper

Similarities between terrestrial shield volcanoes and a volcano on Io observed in Voyager I imagery of the satellite at 30 deg S, 246 deg W are delineated. A photoclinometry model was used to numerically estimate the slope based on the Minnaert photometric function. The slope values are accurate to within 10 deg on the sun-facing slope and 1 deg on the shadow side. As found with shield volcanoes, the feature has a central edifice, 40-50 km in diameter, and a broad, elliptical base, 77 x 90 km across. The summit of the Io volcano is 2.2-2.8 km above the surrounding plane and contains a caldera about 5 km in diameter. The similarity in shape between basaltic terrestrial shield volcanoes and the Io volcano indicates that the Io feature may also be composed of basalt. The composition could be sulfur if the heat flow was under 0.05 W/sq m, as it might have been in later stages of formation.

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