Magmatic gas composition reveals the source depth of slug-driven Strombolian explosive activity

被引:268
作者
Burton, Mike [1 ]
Allard, Patrick
Mure, Filippo
La Spina, Alessandro
机构
[1] Ist Nazl Geofis & Vulcanol, Catania, Italy
[2] CEA, CNRS, Grp Sci Terre, Lab Pierre Sue, F-91198 Gif Sur Yvette, France
[3] Univ Palermo, Dipartimento Chim & Fis Terra & Applicaz, Palermo, Italy
关键词
D O I
10.1126/science.1141900
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 (similar to 3 kilometers), where both structural discontinuities and differential bubble-rise speed can promote slug coalescence. The observed decoupling between deep slug genesis and shallow (similar to 250-meter) explosion quakes may be a common feature of strombolian activity, determined by the geometry of plumbing systems.
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收藏
页码:227 / 230
页数:4
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