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

M. Paulatto, Catherine J Annen, T J Henstock, Emma J Kiddle, T. A. Minshull, R S J Sparks, B Voight

Research output: Contribution to journalArticle (Academic Journal)peer-review

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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.
Original languageEnglish
Article numberQ01014
Number of pages18
JournalGeochemistry, Geophysics, Geosystems
Volume13
Issue number1
DOIs
Publication statusPublished - Jan 2012

Bibliographical note

Copyright 2012 by the American Geophysical Union.

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