气候变化领域集成服务门户(CCPortal): Infrasound from giant bubbles during explosive submarine eruptions

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DOI	10.1038/s41561-019-0461-0
	Infrasound from giant bubbles during explosive submarine eruptions
	Lyons J.J.; Haney M.M.; Fee D.; Wech A.G.; Waythomas C.F.
发表日期	2019
ISSN	17520894
卷号	12 期号:11
英文摘要	Shallow submarine volcanoes pose unique scientific and monitoring challenges. The interaction between water and magma can create violent explosions just below the surface, but the inaccessibility of submerged volcanoes means they are typically not instrumented. This both increases the risk to marine and aviation traffic and leaves the underlying eruption physics poorly understood. Here we use low-frequency sound in the atmosphere (infrasound) to examine the source mechanics of shallow submarine explosions from Bogoslof volcano, Alaska. We show that the infrasound originates from the oscillation and rupture of magmatic gas bubbles that initially formed from submerged vents, but that grew and burst above sea level. We model the low-frequency signals as overpressurized gas bubbles that grow near the water–air interface, which require bubble radii of 50–220 m. Bubbles of this size and larger have been described in explosive subaqueous eruptions for more than a century, but we present a unique geophysical record of this phenomenon. We propose that the dominant role of seawater during the effusion of gas-rich magma into shallow water is to repeatedly produce a gas-tight seal near the vent. This resealing mechanism leads to sequences of violent explosions and the release of large, bubble-forming volumes of gas—activity we describe as hydrovulcanian. © 2019, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.
语种	英语
scopus关键词	bubble; ejecta; explosive volcanism; gas flow; infrasonics; magma; mechanics; oscillation; rupture; shallow water; underwater environment; volcanic aerosol
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124580
作者单位	US Geological Survey, Alaska Volcano Observatory, Anchorage, AK, United States; Geophysical Institute, Alaska Volcano Observatory, University of Alaska Fairbanks, Fairbanks, AK, United States
推荐引用方式 GB/T 7714	Lyons J.J.,Haney M.M.,Fee D.,et al. Infrasound from giant bubbles during explosive submarine eruptions[J],2019,12(11).
APA	Lyons J.J.,Haney M.M.,Fee D.,Wech A.G.,&Waythomas C.F..(2019).Infrasound from giant bubbles during explosive submarine eruptions.Nature Geoscience,12(11).
MLA	Lyons J.J.,et al."Infrasound from giant bubbles during explosive submarine eruptions".Nature Geoscience 12.11(2019).