Activity at the Soufriere Hills Volcano has remained at a relatively low level today. It was dominated by small rockfalls and a sustained period of low amplitude broadband tremor that lasted most of last night.
A total of 53 rockfall events were recorded during this period, 10 fewer than yesterday. The largest rockfalls occurred at 04:13, 07:39, 13:53 and 15:56 on 20 June. No visible ash clouds were associated with these events. Long period and hybrid earthquakes continued to occur in small quantities. There was 3 long-period and 5 hybrid events. Low-amplitude broadband tremor was recorded from 21:20 on 20 June until about 04:00 on 21 June.
Viewing conditions have again been inhibited by low cloud cover. No sightings of the dome were therefore possible. No COSPEC measurements were carried out today,.
EDM measurements were not made today due to the poor weather conditions. The dry tilt network at Amersham was reoccupied instead; this technique measures changes in the slope gradient of the volcano that sources deep beneath it could influence. The results are not yet computed. GPS campaigns were also continued at the some of the eastern benchmarks including Harris, Farrels and Roaches Yard. Preliminary results from yesterday's campaigns indicated that the changes remain within the instrumental error.
The volcano remain highly dangerous to people and property on both it's eastern and upper western flanks. 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 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 death.