Montserrat Volcano Observatory

Daily Report
Report for the period 16:00 30 June
to 16:00 1 July 1996

Activity at the Soufriere Hills Volcano has been at about the same relatively low level as during the previous twenty-four hours. Small and moderate-sized rockfalls from the lava dome still dominate activity.

The rockfall activity was at a very similar level to yesterday, with 57 rockfall events recorded on the seismic network. The largest of these occurred at 00:13, 11:45 and 14:24 on 1 July. There were no reports of ash clouds or ashfall from any of these rockfalls. The number of long period and hybrid earthquakes remained low at 11 and 12 respectively. Two very small volcano-tectonic earthquakes were recorded. There were two periods of low-amplitude broadband tremor. During the first, from about 21:00 on 20 June until just after midnight, tremor was almost continuous. It was more intermittent during the second period, from about 02:00 until 05:10 on 1 July. One regional earthquake was recorded in this reporting period.

Visibility was poor for much of the day, with the summit obscured by clouds. It was possible to see parts of the dome at times. Some rockfalls were observed from the southern flank of the dome.

No COSPEC measurements were made today. Data from the all-day experiment yesterday has been processed and the initial results show that there is no significant systematic variation in the gas production from the volcano.

EDM measurements were taken on the western triangle and on the White's Yard to Castle Peak line in the eastern triangle. The data is still being processed.

The Soufriere Hills Volcano is still considered to be highly dangerous to people and property on it's eastern and upper western flanks. Visits to the evacuated zone must 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 extremely dangerous. All access roads remain closed and people should not enter these areas under any circumstances. If they do, they put themselves and others at direct risk of serious injury or death.

Montserrat Volcano Observatory