Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3105
AuthorsBurton, M.* 
Allard, P.* 
Murè, F.* 
La Spina, A.* 
TitleMagmatic Gas Composition Reveals the Source Depth of Slug-Driven Strombolian Explosive Activity
Issue Date13-Jul-2007
Series/Report no./317 (2007)
DOI10.1126/science.1141900
URIhttp://hdl.handle.net/2122/3105
KeywordsStrombolian activity
FTIR
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
AbstractStrombolian-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.
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