气候变化领域集成服务门户(CCPortal): Linking Magma Storage and Ascent to Eruption Volume and Composition at an Arc Caldera

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DOI	10.1029/2020GL088122
	Linking Magma Storage and Ascent to Eruption Volume and Composition at an Arc Caldera
	Miller D.; Bennington N.; Haney M.; Bedrosian P.; Key K.; Thurber C.; Hart L.; Ohlendorf S.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	Conceptual models of magma storage and transport under calderas favor a connected system of sills and dikes. These features are individually below the resolution of standard seismic tomography, but radial seismic anisotropy can reveal where they exist in aggregate. We model radial anisotropy at Okmok caldera, Alaska, to demonstrate the presence of a caldera-centered stacked sill complex and surrounding dike system. We show that ascending magma, inferred from seismicity, either intersects the sill complex, resulting in a larger volume eruption of evolved magma, or bypasses the overlying sill complex via dikes, resulting in a low-volume mafic eruption. Our results exemplify how the locations of magma storage and paths of transport impact eruption size and composition. As this type of crustal storage is likely common to many calderas, this analysis offers a potential new framework for volcano observatories to forecast the size of impending eruptions. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Anisotropy; Hydraulic structures; Levees; Seismic prospecting; Conceptual model; Connected systems; Dike system; Eruption volume; Magma storage; Radial anisotropy; Seismic anisotropy; Seismic tomography; Seismology; caldera; dike; seismic anisotropy; seismic tomography; volcano; Alaska; Aleutian Islands; Fox Islands; Okmok Volcano; Umnak Island; United States
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170094
作者单位	Department of Geoscience, University of Wisconsin-Madison, Madison, WI, United States; Alaska Volcano Observatory, U.S. Geological Survey, Anchorage, AK, United States; U.S. Geological Survey, Denver, CO, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; National Tsunami Warning Center, Palmer, AK, United States
推荐引用方式 GB/T 7714	Miller D.,Bennington N.,Haney M.,et al. Linking Magma Storage and Ascent to Eruption Volume and Composition at an Arc Caldera[J],2020,47(14).
APA	Miller D..,Bennington N..,Haney M..,Bedrosian P..,Key K..,...&Ohlendorf S..(2020).Linking Magma Storage and Ascent to Eruption Volume and Composition at an Arc Caldera.Geophysical Research Letters,47(14).
MLA	Miller D.,et al."Linking Magma Storage and Ascent to Eruption Volume and Composition at an Arc Caldera".Geophysical Research Letters 47.14(2020).