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DOI	10.1029/2019JB019182
	Gas‐pyroclast motions in volcanic conduits during strombolian eruptions, in light of shock tube experiments
	Salvatore V.; Cigala V.; Taddeucci J.; Arciniega‐ceballos A.; Fernández J.J.P.; Alatorre‐ibargüengoitia M.A.; Gaudin D.; Palladino D.M.; Kueppers U.; Scarlato P.
发表日期	2020
ISSN	21699313
起始页码	1
结束页码	17
卷号	125 期号:4
英文摘要	In a Strombolian volcanic eruption, bursting of a pressurized gas pocket accelerates a mixture of gas and pyroclasts along a conduit and out of a vent. While mixture ejection at the vent is the subject of direct geophysical measurements, and a key to eruption understanding, the dynamics of how the mixture moves in the conduit are not observable and only partly understood. Here, we use analog, transparent shock tube experiments to study the dynamics of gas and particles under fast gas decompression in a vertical tube. Maximum particle exit velocity increases linearly with increasing energy (pressure times volume) of the pressurized gas and, subordinately, with decreasing particle size and depth in the tube. Particles, initially at rest, are at first accelerated and dispersed in the conduit by the expanding gas. When the gas decelerates or even reverses its motion due to pressure changes in the tube, the particles, moving under their inertia, are then decelerated by the gas drag. Deceleration lasts longer for lower initial gas energy and for deeper particle starting position. Experiments and eruptions share two key vent ejection features: (1) particles exit the vent already decelerating, and (2) the exit velocity of the particles decays over time following the same nonlinear law. Friction with slower or even backflowing gas likely causes pyroclast deceleration in volcanic conduits during Strombolian explosions. Pyroclast deceleration, in turn, affects their exit velocity at the vent, as well as estimates of the explosion source depth based on temporal changes in exit velocity. © 2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/188015
作者单位	Dipartimento di Scienze della Terra, Sapienza ‐ Università di Roma, Rome, Italy; Department für Geo‐ und Umweltwissenschaften Sektion Mineralogie, Petrologie und Geochemie, Ludwig‐Maximilians‐Universität München, Munich, Germany; Dipartimento di Geoscienze, Università degli Studi di Padova, Padua, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy; Departamento de Vulcanología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico City, Mexico; ISTA, Technische Universität Berlin, Berlin, Germany; Centro de Investigación en Gestión de Riesgos y Cambio Climático, Universidad de Ciencias y Artes de Chiapas, Tuxtla Gutiérrez, Chiapas, Mexico
推荐引用方式 GB/T 7714	Salvatore V.,Cigala V.,Taddeucci J.,等. Gas‐pyroclast motions in volcanic conduits during strombolian eruptions, in light of shock tube experiments[J],2020,125(4).
APA	Salvatore V..,Cigala V..,Taddeucci J..,Arciniega‐ceballos A..,Fernández J.J.P..,...&Scarlato P..(2020).Gas‐pyroclast motions in volcanic conduits during strombolian eruptions, in light of shock tube experiments.Journal of Geophysical Research: Solid Earth,125(4).
MLA	Salvatore V.,et al."Gas‐pyroclast motions in volcanic conduits during strombolian eruptions, in light of shock tube experiments".Journal of Geophysical Research: Solid Earth 125.4(2020).