Conduit dynamics and post explosion degassing on Stromboli: A combined UV camera and numerical modeling treatment. Issue 10 (28th May 2016)

• Record Type: Journal Article
• Authors: Pering, T. D.; McGonigle, A. J. S.; James, M. R.; Tamburello, G.; Aiuppa, A.; Delle Donne, D.; Ripepe, M.
• Is Part Of: Geophysical research letters. Volume 43:Issue 10(2016)
• Page Start: 5009
• Page End: 5016
• Publication Date: 2016-05-28
• Subjects: Strombolian eruptions -- gas slugs -- uv cameras -- gas flux -- daughter bubbles -- computational fluid dynamics; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2016GL069001
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: Recent gas flux measurements have shown that Strombolian explosions are often followed by periods of elevated flux, or "gas codas, " with durations of order a minute. Here we present UV camera data from 200 events recorded at Stromboli volcano to constrain the nature of these codas for the first time, providing estimates for combined explosion plus coda SO2 masses of ≈18–225 kg. Numerical simulations of gas slug ascent show that substantial proportions of the initial gas mass can be distributed into a train of "daughter bubbles" released from the base of the slug, which we suggest, generate the codas, on bursting at the surface. This process could also cause transitioning of slugs into cap bubbles, significantly reducing explosivity. This study is the first attempt to combine high temporal resolution gas flux data with numerical simulations of conduit gas flow to investigate volcanic degassing dynamics. Key Points: Stromboli gas flux data suggest that trains of daughter bubbles may follow gas slugs CFD models suggest a complex relationship between daughter bubble production rate and Nf Bubble production can result in significant mass loss from ascending slugs