Growth of the lava dome and extrusion rates at Soufrière Hills Volcano, Montserrat, West Indies: 2005-2008

Details Growth of the lava dome and extrusion rates at Soufrière Hills Volcano, Montserrat, West Indies: 2005-2008 Growth of the lava dome and extrusion rates at Soufrière Hills Volcano, Montserrat, West Indies: 2005-2008

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3700e08r&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 5, CiteID L00E08

Physics

2

Volcanology: Volcano Monitoring (7280), Volcanology: Magma Migration And Fragmentation, Volcanology: Eruption Mechanisms And Flow Emplacement, Volcanology: Instruments And Techniques

Scientific paper

The third episode of lava dome growth at Soufrière Hills Volcano began 1 August 2005 and ended 20 April 2007. Volumes of the dome and talus produced were measured using a photo-based method with a calibrated camera for increased accuracy. The total dense rock equivalent (DRE) volume of extruded andesite magma (306 ± 51 Mm3) was similar within error to that produced in the earlier episodes but the average extrusion rate was 5.6 ± 0.9 m3s-1 (DRE), higher than the previous episodes. Extrusion rates varied in a pulsatory manner from <0.5 m3s-1 to ˜20 m3s-1. On 18 May 2006, the lava dome had reached a volume of 85 Mm3 DRE and it was removed in its entirety during a massive dome collapse on 20 May 2006. Extrusion began again almost immediately and built a dome of 170 Mm3 DRE with a summit height 1047 m above sea level by 4 April 2007. There were few moderate-sized dome collapses (1-10 Mm3) during this extrusive episode in contrast to the first episode of dome growth in 1995-8 when they were numerous. The first and third episodes of dome growth showed a similar pattern of low (<0.5 m3s-1) but increasing magma flux during the early stages, with steady high flux after extrusion of ˜25 Mm3.

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