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Insights into processes and deposits of hazardous vulcanian explosions at Soufrière Hills Volcano during 2008 and 2009 (Montserrat, West Indies)

Komorowski, J.-C., Legendre, Y., Christopher, T., Bernstein, M., Stewart, R., Joseph, E., Fournier, N., Chardot, L., Finizola, A., Wadge, G., Syers, R., Williams, C. and Bass, V. (2010) Insights into processes and deposits of hazardous vulcanian explosions at Soufrière Hills Volcano during 2008 and 2009 (Montserrat, West Indies). Geophysical Research Letters, 37. L00E19. ISSN 0094-8276

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To link to this article DOI: 10.1029/2010GL042558

Abstract/Summary

During the Soufrière Hills eruption, vulcanian explosions have generally occurred 1) in episodic cycles; 2) isolated during pauses in extrusion, and 3) after major collapses of the dome. In a different eruptive context, significant vulcanian explosions occurred on 29 July 2008, 3 December 2008, and 3 January 2009. Deposits are pumiceous except for the 3 December event. We reconstructed the dispersal pattern of the deposits and their textural characteristics to evaluate erupted volume and vesicularity of the magma at fragmentation. We discuss the implications of these explosions in terms of eruptive processes and chronology, and the hazards posed by their sudden and often unheralded occurrence. We suggest that overpressurization of the conduit can develop over time-scales of months to weeks by a process of self-sealing of conduit walls and/or the cooling dome by silica polymorphs. This work provides new insights for understanding the generation of hazardous vulcanian explosions at andesitic volcanoes.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > National Centre for Earth Observation (NCEO)
Faculty of Science > School of Mathematical and Physical Sciences > Environmental Systems Science Centre
ID Code:7512
Uncontrolled Keywords:vulcanian explosions; pumice deposits; silica self-sealing; Volcanology: Explosive volcanism; Volcanoclastic deposits; Volcanic hazards and risks; Field relationships
Publisher:American Geophysical Union

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