Anatomy of an active submarine volcano

TitleAnatomy of an active submarine volcano
Publication TypeJournal Article
Year of Publication2014
AuthorsArnulf A.F, Harding A.J, Kent G.M, Carbotte S.M, Canales J.P, Nedimovic M.R
JournalGeology
Volume42
Pagination655-658
Date Published2014/08
Type of ArticleArticle
ISBN Number0091-7613
Accession NumberWOS:000339961600004
Keywordsapril 2011 eruption; axial seamount; beneath; juan-de-fuca; lucky strike volcano; mauna-loa; morphology; resolution; ridge; streamer data
Abstract

Most of the magma erupted at mid-ocean ridges is stored in a mid-crustal melt lens that lies at the boundary between sheeted dikes and gabbros. Nevertheless, images of the magma pathways linking this melt lens to the overlying eruption site have remained elusive. Here, we have used seismic methods to image the thickest magma reservoir observed beneath any spreading center to date, which is principally attributed to the juxtaposition of the Juan de Fuca Ridge with the Cobb hotspot (northwestern USA). Our results reveal a complex melt body, which is similar to 14 km long, 3 km wide, and up to 1 km thick, beneath the summit caldera. The estimated volume of the reservoir is 18-30 km(3), more than two orders of magnitude greater than the erupted magma volumes of either the A. D. 1998 or 2011 eruption. Our images show a network of sub-horizontal to shallow-dipping (<30 degrees) features that we interpret as pathways facilitating melt transport from the magma reservoir to the eruption sites.

DOI10.1130/g35629.1
Short TitleGeology
Integrated Research Themes: 
Student Publication: 
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