气候变化领域集成服务门户(CCPortal): Magma-Fluid Interactions Beneath Akutan Volcano in the Aleutian Arc Based on the Results of Local Earthquake Tomography

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DOI	10.1029/2020JB021192
	Magma-Fluid Interactions Beneath Akutan Volcano in the Aleutian Arc Based on the Results of Local Earthquake Tomography
	Koulakov I.; Komzeleva V.; Smirnov S.Z.; Bortnikova S.B.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	Akutan Island hosts a volcano considered as one of most active in the Aleutian Arc. We build a new tomography model including the 3D distributions of the Vp, Vs, and Vp/Vs ratio based on arrival time data from more than 4,000 local earthquakes recorded by 13 seismic stations. In this model, we reveal a columnar anomaly of high Vp, low Vs, and high Vp/Vs ratio with a top boundary at a depth of ∼6 km below sea level, which represents a steady conduit feeding the Akutan volcano. In the upper part of the tomographic model, the highly heterogeneous structures are associated with interactions of shallow magmatic sources, meteoric and magmatic fluids, as well as degassing. Beneath the summit area of Akutan, we observe a prominent anomaly of high Vp/Vs, which may represent a shallow magma reservoir directly responsible for recent eruption activity and ongoing gas emission through the summit fumarole. The other fumarole field at the eastern flank of the volcano appears to be associated with a seismically active zone of low Vp/Vs ratio at depths of 2–4 km below surface. These structures indicate different depths of magma degassing in these two areas, which may explain distinct geochemical features of emitted gases. Besides the prominent anomaly representing the shallow magma reservoir beneath the caldera and the active cone, we observe several areas with high Vp/Vs ratio, some of which are interpreted as shallow magma storage regions, and some as zones of meteoric water penetration. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Akutan volcano; Aleutian arc; local seismicity; magma conduit; meteoric and magmatic fluids; seismic tomography
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/187323
作者单位	Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russian Federation; Novosibirsk State University, Novosibirsk, Russian Federation; Institute of Volcanology and Seismology FEB RAS, Petropavlovsk-Kamchatsky, Russian Federation; Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russian Federation
推荐引用方式 GB/T 7714	Koulakov I.,Komzeleva V.,Smirnov S.Z.,et al. Magma-Fluid Interactions Beneath Akutan Volcano in the Aleutian Arc Based on the Results of Local Earthquake Tomography[J],2021,126(3).
APA	Koulakov I.,Komzeleva V.,Smirnov S.Z.,&Bortnikova S.B..(2021).Magma-Fluid Interactions Beneath Akutan Volcano in the Aleutian Arc Based on the Results of Local Earthquake Tomography.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Koulakov I.,et al."Magma-Fluid Interactions Beneath Akutan Volcano in the Aleutian Arc Based on the Results of Local Earthquake Tomography".Journal of Geophysical Research: Solid Earth 126.3(2021).