Document Detail


Magma storage beneath Axial volcano on the Juan de Fuca mid-ocean ridge.
MedLine Citation:
PMID:  11677604     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Axial volcano, which is located near the intersection of the Juan de Fuca ridge and the Cobb-Eickelberg seamount chain beneath the northeast Pacific Ocean, is a locus of volcanic activity thought to be associated with the Cobb hotspot. The volcano rises 700 metres above the ridge, has substantial rift zones extending about 50 kilometres to the north and south, and has erupted as recently as 1998 (ref. 2). Here we present seismological data that constrain the three-dimensional velocity structure beneath the volcano. We image a large low-velocity zone in the crust, consisting of a shallow magma chamber and a more diffuse reservoir in the lower crust, and estimate the total magma volume in the system to be between 5 and 21 km3. This volume is two orders of magnitude larger than the amount of melt emplaced during the most recent eruption (0.1-0.2 km3). We therefore infer that such volcanic events remove only a small portion of the reservoir that they tap, which must accordingly be long-lived compared to the eruption cycle. On the basis of magma flux estimates, we estimate the crustal residence time of melt in the volcanic system to be a few hundred to a few thousand years.
Authors:
M West; W Menke; M Tolstoy; S Webb; R Sohn
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  413     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  2001 Oct 
Date Detail:
Created Date:  2001-10-25     Completed Date:  2001-12-05     Revised Date:  2003-10-31    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  833-6     Citation Subset:  -    
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA. mwest@ldeo.columbia.edu
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