Montserrat Volcano Observatory

Daily Report
Report for the period 16:00 11 June
to 16:00 12 June 1996

Activity at the Soufriere Hills volcano was at a slightly lower level during this reporting period than during the last. The activity remains concentrated on the north and north-western flanks of the dome and is dominated by small to moderate-sized rockfalls.

A total of 59 rockfall events were recorded during the reporting period. The largest of these rockfalls occurred at 08:49 and 10:52 on 12 June. There was one hybrid events and 2 long period earthquakes during this period. All of these seismicity counts are at lower levels than yesterday, but this does not mark any significant reduction in activity at the volcano. Intermittent low-amplitude broadband tremor was recorded on the Gages seismometer from about 23:00 to 23:30 on 11 June and 04:30 to 09:30 on 12 June and is probably due to increased steam emission from the volcano after overnight rain.

Observations of the dome were not made today due to persistent low cloud obscuring the upper flanks of the volcano. Very small ash clouds were seen associated with larger rockfall events, but ash generation appears to have decreased since the switch in the focus of dome growth activity to the northwestern side.

EDM measurements were not possible today due to the low cloud. The latest estimate for the height of the top of the dome is 3095 ft; this is nearly 100 ft higher than Chances Peak.

COSPEC measurements of the SO2 gas concentration in the volcanic plume were made today but the results are still being processed.

Scientists at the Montserrat Volcano Observatory remain highly concerned about the current state of the volcano and the dangers to people and property on both the eastern and upper western flanks of the volcano. Visits to the evacuated zone should be kept to an absolute minimum. The Tar River, Long Ground and Whites areas to the east and upper Fort Ghaut, Gages Village and Upper Amersham areas to the west are all now extremely dangerous. The road between Lee's Estate and Ryners Village remains closed. People should not enter these areas under any circumstances. If they do, they put themselves and others at direct risk of serious injury or hideous death.

Montserrat Volcano Observatory