Sensitivity of OMI SO2 measurements to variable eruptive behaviour at Soufrière Hills Volcano, Montserrat

Hayer, C. S. and Wadge, G. and Edmonds, M. and Christopher, T. (2016) Sensitivity of OMI SO2 measurements to variable eruptive behaviour at Soufrière Hills Volcano, Montserrat. Journal of Volcanology and Geothermal Research, 312. pp. 1-10. ISSN 0377-0273 DOI 10.1016/j.jvolgeores.2016.01.014

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Abstract

Since 2004, the satellite-borne Ozone Mapping Instrument (OMI) has observed sulphur dioxide (SO2) plumes during both quiescence and effusive eruptive activity at Soufrière Hills Volcano, Montserrat. On average, OMI detected a SO2 plume 4–6 times more frequently during effusive periods than during quiescence in the 2008–2010 period. The increased ability of OMI to detect SO2 during eruptive periods is mainly due to an increase in plume altitude rather than a higher SO2 emission rate. Three styles of eruptive activity cause thermal lofting of gases (Vulcanian explosions; pyroclastic flows; a hot lava dome) and the resultant plume altitudes are estimated from observations and models. Most lofting plumes from Soufrière Hills are derived from hot domes and pyroclastic flows. Although Vulcanian explosions produced the largest plumes, some produced only negligible SO2 signals detected by OMI. OMI is most valuable for monitoring purposes at this volcano during periods of lava dome growth and during explosive activity.

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA70
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
07 - Gold Open Access
Journal or Publication Title: Journal of Volcanology and Geothermal Research
Volume: 312
Page Range: pp. 1-10
Identification Number: 10.1016/j.jvolgeores.2016.01.014
Depositing User: Sarah Humbert
Date Deposited: 28 Apr 2016 11:57
Last Modified: 28 Apr 2016 11:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/3641

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