Montserrat Volcano Observatory

Daily Report
Report for the period 16:00 21 May
to 16:00 22 May 1996

Volcanic activity at the Soufriere Hills volcano during this period continued at about the same level as yesterday. Seismicity continues to be dominated by small- to moderate-sized rockfall signals. There were 4 long-period events and no VT earthquakes recorded by the seismic network today. The very small repetitive hybrid events which appeared on the Chances Peak seismic station on Saturday 18 May have declined in size and frequency and are now no longer being recorded. Variable amounts of low-amplitude tremor was recorded on the Gages seismograph station throughout the reporting period.

Visibility was very poor, and the dome was covered in low cloud and intermittent rainfall all day.

No EDM measurements were made due to the poor visibility. Technical problems were experienced with the GPS equipment today; this prevented any measurement from being made.

Further gas measurements were made today using COSPEC. This data has not yet been processed but the data from yesterday shows an SO2 flux of about 205 +/- 50 tonnes per day. This is slightly higher than yesterday's results but is still consistent with previous low levels of SO2 flux. FTIR gas measurements were made today between St Georges Hill and Amersham. The results of these measurements are still being processed.

Lloyd Lynch of the Seismic Research Unit left Montserrat today after a brief fact-finding visit.

The present level of activity at the Soufriere Hills Volcano continues to cause concern to the scientists. The MVO urges that visits to the evacuated zone are kept to a minimum. The Tar River, Long Ground and Whites areas are extremely dangerous and should not be entered under any circumstances.

Montserrat Volcano Observatory