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Magma-sponge hypothesis and stratovolcanoes : case for a compressible reservoir and quasi-steady deep influx at Soufrière hills volcano, Montserrat

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Magma-sponge hypothesis and stratovolcanoes : case for a compressible reservoir and quasi-steady deep influx at Soufrière hills volcano, Montserrat

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dc.contributor.author Voight, Barry
dc.contributor.author Widiwijayanti, Christina
dc.contributor.author Mattioli, Glen
dc.contributor.author Elsworth, Derek
dc.contributor.author Hidayat, Dannie
dc.contributor.author Strutt, M.
dc.date.accessioned 2012-10-29T03:16:06Z
dc.date.available 2012-10-29T03:16:06Z
dc.date.copyright 2010
dc.date.issued 2012-10-29
dc.identifier.citation Voight, B., Widiwijayanti, C., Mattioli, G., Elsworth, D., Hidayat, D., & Strutt, M. (2010). Magma-sponge hypothesis and stratovolcanoes: Case for a compressible reservoir and quasi-steady deep influx at Soufrière Hills Volcano, Montserrat. Geophysical Research Letters, 37.
dc.identifier.issn 0094-8276
dc.identifier.uri http://hdl.handle.net/10220/8812
dc.description.abstract We use well-documented time histories of episodic GPS surface deformation and efflux of compressible magma to resolve apparent magma budget anomalies at Soufrière Hills volcano (SHV) on Montserrat, WI. We focus on data from 2003 to 2007, for an inflation succeeded by an episode of eruption-plus-deflation. We examine Mogi-type and vertical prolate ellipsoidal chamber geometries to accommodate both mineralogical constraints indicating a relatively shallow pre-eruption storage, and geodetic constraints inferring a deeper mean-pressure source. An exsolved phase involving several gas species greatly increases andesite magma compressibility to depths >10 km (i.e., for water content >4 wt%, crystallinity ∼40%), and this property supports the concept that much of the magma transferred into or out of the crustal reservoir could be accommodated by compression or decompression of stored reservoir magma (i.e., the “magma-sponge”). Our results suggest quasi-steady deep, mainly mafic magma influx of the order of 2 m3s−1, and we conclude that magma released in eruptive episodes is approximately balanced by cumulative deep influx during the eruptive episode and the preceding inflation. Our magma-sponge model predicts that between 2003 and 2007 there was no evident depletion of magma reservoir volume at SHV, which comprises tens of km3 with radial dimensions of order ∼1–2 km, in turn implying a long-lived eruption.
dc.language.iso en
dc.relation.ispartofseries Geophysical research letters
dc.rights © 2010 American Geophysical Union. This paper was published in Geophysical Research Letters and is made available as an electronic reprint (preprint) with permission of American Geophysical Union. The paper can be found at: [DOI: http://dx.doi.org/10.1029/2009GL041732]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
dc.subject DRNTU::Science::Geology::Volcanoes and earthquakes
dc.title Magma-sponge hypothesis and stratovolcanoes : case for a compressible reservoir and quasi-steady deep influx at Soufrière hills volcano, Montserrat
dc.type Journal Article
dc.identifier.doi http://dx.doi.org/10.1029/2009GL041732
dc.description.version Published version

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