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Report on Soufriere Hills (United Kingdom) — 11 April-17 April 2007

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 11 April-17 April 2007
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2007. Report on Soufriere Hills (United Kingdom). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 11 April-17 April 2007. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (11 April-17 April 2007)


Soufriere Hills

United Kingdom

16.72°N, 62.18°W; summit elev. 915 m

All times are local (unless otherwise noted)


Based on visual observations, lava-dome growth at Soufrière Hills continued at a reduced rate during 6-13 April. Material originating from the E-facing shear lobe was shed down the Tar River Valley. Minor rockfalls and pyroclastic flows were noted. On 17 April, a small pyroclastic flow was observed to the NW in the upper part of Tyres Ghaut. The lava-dome volume was an estimated 208 million cubic meters.

Geologic Background. The complex, dominantly andesitic Soufrière Hills volcano occupies the southern half of the island of Montserrat. The summit area consists primarily of a series of lava domes emplaced along an ESE-trending zone. The volcano is flanked by Pleistocene complexes to the north and south. English's Crater, a 1-km-wide crater breached widely to the east by edifice collapse, was formed about 2000 years ago as a result of the youngest of several collapse events producing submarine debris-avalanche deposits. Block-and-ash flow and surge deposits associated with dome growth predominate in flank deposits, including those from an eruption that likely preceded the 1632 CE settlement of the island, allowing cultivation on recently devegetated land to near the summit. Non-eruptive seismic swarms occurred at 30-year intervals in the 20th century, but no historical eruptions were recorded until 1995. Long-term small-to-moderate ash eruptions beginning in that year were later accompanied by lava-dome growth and pyroclastic flows that forced evacuation of the southern half of the island and ultimately destroyed the capital city of Plymouth, causing major social and economic disruption.

Source: Montserrat Volcano Observatory (MVO)