Rod Stewart

University of the West Indies

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Steve Sparks

University of Bristol

Rodrigo Contreras-Arratia

Temuco Catholic University

Willy Aspinall

University of Bristol

Jürgen Neuberg

University of Leeds

Ian A. Renfrew

University of East Anglia

Brian Baptie

British Geological Survey

Jenni Barclay

University of East Anglia

Richard Luckett

British Geological Survey

Cooperative Institutions

Montserrat Volcano Observatory

University of Bristol

University of Leeds

British Geological Survey

Cabot (United States)

University of the West Indies

Delft University of Technology

University of East Anglia

Norwich Research Park

Cambridge University Press

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Results from the Broadband Seismic Network on Montserrat

Geophysical Research Letters (1998)

Jürgen Neuberg Brian Baptie Richard Luckett Rod Stewart

A digital broadband seismic network has been installed around Soufriere Hills Volcano on Montserrat. While several distinctive types of seismic events with frequencies ranging from 0.5Hz to 30Hz could be identified, the emphasis is on two types of low‐frequency events which indicate the involvement of a fluid phase in the source mechanism: the so‐called long‐period events and the hybrid events. The latter occur in swarms with distinct periodicities of 4 to 12 hours and preceed major dome collapses and explosions. The swarms correlate very well with the tilt observed at the flanks of the volcanic edifice and, hence, can be linked to the pressurization of the magmatic system. Occasionally separate hybrid events merge and form harmonic tremor, which sometimes has a shifting spectral content. This reveals temporary changes in the source parameters. Low‐frequency seismic signals on Montserrat are considered to be key parameters for the monitoring of the internal dynamics of the volcano.

Tiltmeter

Merge (version control)

10.1029/98gl01441

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Citations (87)

Analysis of magma flux and eruption intensity during the 2021 explosive activity at La Soufrière, St Vincent, West Indies

Geological Society London Special Publications (2023)

Steve Sparks Willy Aspinall Jenni Barclay Ian A. Renfrew Rodrigo Contreras-Arratia

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 volcano. 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 independent 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.

Magma chamber

10.1144/sp539-2022-286

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The Arunta Inlier : a complex ensialic mobile belt in central Australia. Part 1 : stratigraphy, correlations and origin.

Rod Stewart

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