Discovery of Episodic Volcanism at Prometheus on Io: Implications for Magma Supply

Details Discovery of Episodic Volcanism at Prometheus on Io: Implications for Magma Supply Discovery of Episodic Volcanism at Prometheus on Io: Implications for Magma Supply

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7291d&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7291

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Galileo Near Infrared Mapping Spectrometer data show that the ionian volcano Prometheus exhibits an episodicity in activity on a time scale of 7 to 9 months. This episodicity yields valuable constraints to the mechanisms of magma supply and eruption at Prometheus. The total flux from Prometheus over the 1790 days covered by the NIMS dataset used in this analysis is 3.6 × 1019 J. Eruption volumetric rates derived from scaling rates derived from June 1996 NIMS data yield maximum and average volumetric eruption rates of 128 and 52 m^3/s (for cases where emission angle < 60^o). Including all data at all emission angles, volumetric eruption rates range from 14 to 210 m^3/s. Taking one cycle of activity, from 19 Sept 1997 to 31 May 1998 (a period of 8.4 months) the total thermal output is 5 × 1018 J. The eruption apparently builds to a peak and dies away, very much like observed activity at some terrestrial volcanoes. Using models of thermal emission to estimate volume of erupted material the total volume erupted during this time is 0.8 to 3 km^3, with average supply rates in the range 40-143 m^3/s. The total pulse volume of material provides another constraint for modelers of the mechanisms of supply, ascent and eruption at Prometheus. The period might, for example, be the eruption-recharge period of a magma chamber. The volume of the magma chamber (or at least the volume evacuated) has a radius of ˜600-900 m for the calculated total mass erupted. This behaviour at Prometheus greatly strengthens the Kilauea-Prometheus analogy. Kilauea undergoes a similar cyclic activity as magma moves through a complex plumbing system.

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