Pressure changes in the magmatic system during the December 2008/January 2009 extrusion event at Soufrière Hills Volcano, Montserrat (W.I.), derived from strain data analysis

Stefanie Hautmann, Dannie Hidayat, Nicolas Fournier, Alan Linde, Selwyn Sacks, Pyiko Williams

Research output: Contribution to journalArticle (Academic Journal)

16 Citations (Scopus)

Abstract

In December 2008/January 2009 a 4-week episode of lava extrusion characterised by rapid dome growth and ground deflation occurred at Soufrière Hills Volcano (SHV), Montserrat W.I. Recorded strain dilatometer data show strain changes up to −3500 ns during this event. Modelling the collected data assuming existing structural models of the magmatic system, best-fit solutions are obtained for a simultaneous decompression of the shallow and the mid-crustal magma chambers together with a dilation of the shallow yke-conduit. We interpret our model results as magma ascending from the two chambers into the eruption feeding dyke-conduit and partly extruding at the surface. Dome growth volume estimations from visual observations at SHV fit the extrusion volume inferred from our best-fit model and support our results. The reported data is the first set of geodetic data that documents the dynamic coupling within the entire crustal magmatic system of SHV.
Original languageEnglish
Pages (from-to)34
Number of pages41
JournalJournal of Volcanology and Geothermal Research
Volume250
DOIs
Publication statusPublished - Jan 2013

Keywords

  • Soufrière Hills Volcano
  • strain data modelling
  • magmatic system
  • magma migration

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