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Magma chamber properties from integrated seismic tomography and thermal modeling at Montserrat

Magma chamber properties from integrated seismic tomography and thermal modeling at Montserrat
Magma chamber properties from integrated seismic tomography and thermal modeling at Montserrat
It is widely believed that andesitic magmas erupted at arc-volcanoes are stored in shallow reservoirs prior to eruption, but high-resolution images of focused regions of magma in the shallow crust are rare. We integrate seismic tomography with numerical models of magma chamber growth to constrain the magma chamber beneath Soufrière Hills Volcano, Montserrat. Our approach reveals the characteristics and dynamics of the magmatic system with a level of detail that no single method has yet achieved. The integrated analysis suggests that a magma chamber of 13 km3 with over 30% melt fraction formed between 5.5 and at least 7.5 km depth, a significantly higher melt fraction than inferred from the seismic data alone. The magma chamber may have formed by incremental sill intrusion over a few thousand years and is likely to be a transient, geologically short-lived feature. These volume and geometry estimates are critical parameters to model eruption dynamics, which in turn are key to hazard assessment and eruption forecasting.
1525-2027
Q01014
Paulatto, Michele
14063417-6e58-439d-a78e-003a40f01726
Annen, Catherine
5a8d6fe5-4d7b-4790-849a-17190627af2c
Henstock, Timothy J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Kiddle, E
a1aa9894-0784-46bc-8d41-36dc069c8d84
Minshull, Timothy A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Sparks, R.S.J.
68a691b3-ce7a-47fb-929d-c2392048ab60
Voigt, B.
a2c335a9-2253-407a-a02f-78d932a62624
Paulatto, Michele
14063417-6e58-439d-a78e-003a40f01726
Annen, Catherine
5a8d6fe5-4d7b-4790-849a-17190627af2c
Henstock, Timothy J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Kiddle, E
a1aa9894-0784-46bc-8d41-36dc069c8d84
Minshull, Timothy A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Sparks, R.S.J.
68a691b3-ce7a-47fb-929d-c2392048ab60
Voigt, B.
a2c335a9-2253-407a-a02f-78d932a62624

Paulatto, Michele, Annen, Catherine, Henstock, Timothy J., Kiddle, E, Minshull, Timothy A., Sparks, R.S.J. and Voigt, B. (2012) Magma chamber properties from integrated seismic tomography and thermal modeling at Montserrat. Geochemistry, Geophysics, Geosystems, 13, Q01014. (doi:10.1029/2011GC003892).

Record type: Article

Abstract

It is widely believed that andesitic magmas erupted at arc-volcanoes are stored in shallow reservoirs prior to eruption, but high-resolution images of focused regions of magma in the shallow crust are rare. We integrate seismic tomography with numerical models of magma chamber growth to constrain the magma chamber beneath Soufrière Hills Volcano, Montserrat. Our approach reveals the characteristics and dynamics of the magmatic system with a level of detail that no single method has yet achieved. The integrated analysis suggests that a magma chamber of 13 km3 with over 30% melt fraction formed between 5.5 and at least 7.5 km depth, a significantly higher melt fraction than inferred from the seismic data alone. The magma chamber may have formed by incremental sill intrusion over a few thousand years and is likely to be a transient, geologically short-lived feature. These volume and geometry estimates are critical parameters to model eruption dynamics, which in turn are key to hazard assessment and eruption forecasting.

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More information

Published date: 20 January 2012
Organisations: Geology & Geophysics, Ocean and Earth Science

Identifiers

Local EPrints ID: 208875
URI: http://eprints.soton.ac.uk/id/eprint/208875
ISSN: 1525-2027
PURE UUID: 8692e100-6f9a-42f5-89d8-24e9bc0a8a2c
ORCID for Timothy J. Henstock: ORCID iD orcid.org/0000-0002-2132-2514
ORCID for Timothy A. Minshull: ORCID iD orcid.org/0000-0002-8202-1379

Catalogue record

Date deposited: 24 Jan 2012 09:36
Last modified: 28 Apr 2022 01:46

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Contributors

Author: Michele Paulatto
Author: Catherine Annen
Author: E Kiddle
Author: R.S.J. Sparks
Author: B. Voigt

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