Magmatic Gas Composition Reveals the Source Depth of Slug-Driven Strombolian Explosive Activity
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...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2007-07, Vol.317 (5835), p.227-230 |
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| creator | Burton, Mike Allard, Patrick Muré, Filippo La Spina, Alessandro |
| description | 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. |
| doi_str_mv | 10.1126/science.1141900 |
| format | Article |
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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. 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| source | Science Magazine; JSTOR Archive Collection A-Z Listing |
| subjects | Basalt Crystalline rocks Degasification Earth sciences Earth, ocean, space Exact sciences and technology Explosives Gas composition Gas explosions Geochemistry Geophysics Igneous and metamorphic rocks petrology, volcanic processes, magmas Magma Soil and rock geochemistry Spectrum analysis Vapor phases Volatility Volcanoes Volcanology |
| title | Magmatic Gas Composition Reveals the Source Depth of Slug-Driven Strombolian Explosive Activity |
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