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ToolsSparks, R. J. Steve, Aspinall, Willy P., Barclay, Jenni, Renfrew, Ian, Contreras-Arratia, Rodrigo and Stewart, Robert (2024) Analysis of magma flux and eruption intensity during the 2021 explosive activity at La Soufrière, St Vincent, West Indies. In: Geological Society Special Publication. Geological Society Special Publications, 539 (1). Geological Society of London, pp. 63-79.
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Abstract
Real-time Seismic Amplitude Measurement signals and eruption cloud height measurements were used to estimate peak intensities of 40 explosive events during the 8–22 April 2021 activity of La Soufrière vol-cano. We estimated magma supply rates and erupted volumes in each explosion, characterized uncertainty by stochastic modelling and identified four eruptive stages. Stage 1 included an intense period of 9.5 hours with 11 explosive events with peak eruption intensity between 2000 and 4000 m 3 s −1 and magma supply rate reaching 828 m 3 s −1. Twelve high-intensity explosions (c. 4000 m 3 s −1) occurred in Stage 2 with average magma supply rate of 251 m 3 s −1. Stage 3 involved both declining intensity and magma supply rate and lengthening repose periods between explosions. Stage 4 involved three much weaker explosions. The total erupted volume of magma is estimated at 38.5 × 10 6 m 3 (90% credible interval: [22.0.. 61.9] × 10 6 m 3) consistent with indepen-dent estimates from analysis of tephra deposits and volcano subsidence sourced at c. 6 km depth. The 150-fold increase in magma supply rate, from the preceding effusive phase to Stage 1 of the explosive phase, is attributed to replacement of very high-viscosity degassed magma occupying the shallow conduit system with new, lower-viscosity, volatile-rich magma from the magma chamber.
| Item Type: | Book Section |
|---|---|
| Additional Information: | Issue: The 2020-21 Eruption of La Soufrière Volcano, St Vincent |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA |
| UEA Research Groups: | Faculty of Science > Research Groups > Geosciences Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 03 May 2023 13:30 |
| Last Modified: | 13 Feb 2025 01:52 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/91984 |
| DOI: | 10.1144/SP539-2022-286 |
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