Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/94959
Title: Magma-sponge hypothesis and stratovolcanoes : case for a compressible reservoir and quasi-steady deep influx at Soufrière hills volcano, Montserrat
Authors: Strutt, M.
Voight, Barry
Widiwijayanti, Christina
Mattioli, Glen
Elsworth, Derek
Hidayat, Dannie
Keywords: DRNTU::Science::Geology::Volcanoes and earthquakes
Issue Date: 2010
Source: 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.
Series/Report no.: Geophysical research letters
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.
URI: https://hdl.handle.net/10356/94959
http://hdl.handle.net/10220/8812
ISSN: 0094-8276
DOI: http://dx.doi.org/10.1029/2009GL041732
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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EOS Journal Articles

Google ScholarTM

Check

Altmetric

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.