Montserrat Volcano Observatory

Weekly Report
Report for the period 5 p.m. 16 April 1999
to 5 p.m. 23 April 1999

Activity at the volcano has been lower than last week.

A total of 48 rockfall signals, 1 hybrid earthquake, 1 long period earthquake and 34 volcano-tectonic earthquakes were recorded over the last week. The signals were evenly distributed through the week.

There were only 2 ash venting events in the last week. These were both of small magnitude, and produced low level ash clouds that drifted to the west.

Occasional observations during the week showed that fumarolic activity was still vigorous in the area at the top of the Tar River valley.

A GPS occupation of Whites in conjunction with the permanent stations at Hermitage, Harris, Mongo Hill and South Soufriere was completed this week, and results will be reported later.

Residents of Montserrat are advised to keep listening to ZJB Radio Montserrat for information in case of any changes in the state of the volcano.

Montserrat Volcano Observatory