Seismic hybrid swarm precursory to a major lava dome collapse : 9-12 July 2003, Soufriere Hills Volcano, Monserrat

Ottemoller, Lars. 2008 Seismic hybrid swarm precursory to a major lava dome collapse : 9-12 July 2003, Soufriere Hills Volcano, Monserrat. Journal of Volcanology and Geothermal Research, 177 (4). 903-910. https://doi.org/10.1016/j.jvolgeores.2008.07.002

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Abstract/Summary

A swarm of ≈ 9500 hybrid earthquakes preceded the 12–13 July 2003 dome collapse at Soufriere Hills Volcano, Montserrat. Most events had nearly identical waveforms and cross-correlation was applied to measure inter-event periods as well as phase arrival times to determine accurate relative location. Hypocenter depths were shallow (< 3 km), and relative locations were confined to a radius of < 150 m. This small source volume is consistent with the observed waveform similarity. Changes in inter-event periods and energy release, measured from the seismic records, showed that the volcano evolved through several energetic states, possibly linked to cyclic magma movement. Shorter inter-event periods were linked to higher energy release rates and possibly reflect increased pressurization during periods of low extrusion rates.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.jvolgeores.2008.07.002
Programmes:	BGS Programmes 2008 > Earth hazards and systems
ISSN:	0377-0273
Additional Keywords:	Lavas, Montserrat
NORA Subject Terms:	Earth Sciences
Date made live:	12 Feb 2009 14:12 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/6084

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