Saturday, October 24, 2009

Soufriere Hills Volcano, Montserrat - John Seach

Seismic activity has been high at Soufriere Hills volcano, Montserrat during the week 16-23 October 2009. One thousand and nineteen rockfall signals, four hundred and sixteen long period events and four volcano-tectonic earthquakes were recorded during the week. Pyroclastic flows occurred down the White River valley to the south and several have reached the sea. Small pyroclastic flows are still occurring in Tuitts Ghaut on the northeast, Gages valley to the west and rarely in Tyers Ghaut. These pyroclastic flows extended less than 2 km. The lava dome is continuing to grow mainly to the south and southeast. Average sulphur dioxide measurements were 465 tons per day, with a range of 261 to 652 tons per day. Heavy rainfall caused lahars in the Belham valley. The Hazard Level is 3 (on an increasing scale from 1-5).
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