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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3105

Authors: Burton, M.*
Allard, P.*
Murè, F.*
La Spina, A.*
Title: Magmatic Gas Composition Reveals the Source Depth of Slug-Driven Strombolian Explosive Activity
Title of journal: Science
Series/Report no.: /317 (2007)
Publisher: AAAS
Issue Date: 13-Jul-2007
DOI: 10.1126/science.1141900
Keywords: Strombolian activity
FTIR
Abstract: Strombolian-type eruptive activity, common at many volcanoes, consists of regular explosions driven by the bursting of gas slugs that rise faster than surrounding magma. Explosion quakes associated with this activity are usually localized at shallow depth; however, where and how slugs actually form remain poorly constrained. We used spectroscopic measurements performed during both quiescent degassing and explosions on Stromboli volcano (Italy) to demonstrate that gas slugs originate from as deep as the volcano-crust interface (~3 kilometers), where both structural discontinuities and differential bubble-rise speed can promote slug coalescence. The observed decoupling between deep slug genesis and shallow (~250-meter) explosion quakes may be a common feature of strombolian activity, determined by the geometry of plumbing systems.
Appears in Collections:04.08.01. Gases
04.08.06. Volcano monitoring
Papers Published / Papers in press

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