Near-vertical supersonic and shock-free gas/magma flow at ionian volcanoes:application to Pillan

Cataldo, Enzo and Davies, Ashley Gerard and Wilson, Lionel (2013) Near-vertical supersonic and shock-free gas/magma flow at ionian volcanoes:application to Pillan. Icarus, 226 (1). pp. 1171-1176. ISSN 0019-1035

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Abstract

In 1997, the Pillan volcano on Io was home to a fierce volcanic eruption that emplaced extensive lava flows and a circular plume deposit. The gas/magma flow issuing from the unresolved vent region appeared to form an almost vertical jet. We consider steady eruptions of gas and magma, and take the vent to be either a fissure or a point source. In the fissure scenario, the upper-conduit flow must reach Mach 1 in the 25-75 m depth range to produce the vent velocities of 550-600 m/s that are required to explain the observed plume heights. Conduit wall deflections in the range 20-30 degrees from vertical (values referring to the upper meter of the conduit) and similar to 26-30% by mass of incorporated crustal SO2 are also needed. In the point-source scenario, sonic flow conditions and similar velocities are achieved in the depth range 350-500 m for similar conduit wall deflections and gas mass proportions in the erupting mixture. Probably, the source of the 140-km-high plume imaged in 1997 was either a similar to 6-11 m-wide fissure, active for similar to 14-40 km along strike, or a circular vent similar to 125-216 m in diameter, the former scenario being preferred. Finally, a shock-free conduit flow is more likely to sustain a tall lava fountain in a near-vacuum.

Item Type:
Journal Article
Journal or Publication Title:
Icarus
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
ID Code:
70314
Deposited By:
Deposited On:
12 Aug 2014 15:25
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 08:57