Montserrat Volcano Observatory

Daily Report
Report for the period 16:00 on 01 April
to 16:00 on 02 April 1996

Rockfalls from the growing dome have continued over the last 24 hours, although there have been fewer during today (Tuesday). Significant rockfall signals were recorded by the seismic network at 18:54 on Monday and at midnight, 03:21, 04:03, 06:06 and 08:48 on Tuesday. A total of 34 rockfall signals were recorded. The event at 06:06 deposited ash in the Corkhill and Old Towne areas, and more ash deposits were reported in Plymouth overnight and during the day.

The volcano has been cloudy for most of the day, so few visual observations have been possible. During an early morning helicopter flight, observers noted further block and ash flows had occurred in the upper Tar River, although the rocks and ash had not been carried as far as the large event on Sunday night. The event at 06:06 this morning ignited several trees.

The number of other seismic events recorded by the network continues to be low. Two volcano-tectonic earthquakes were located, at depths of 2 km beneath Hermitage and near the airport. Eight hybrid and two small long-period earthquakes were also detected. Continuous low-amplitude tremor has been recorded today at the closest station: Chances Peak.

The Long Ground - Whites - Castle Peak EDM triangle was measured today. The results show only very small changes. The recent trend on these lines indicates that Castle Peak continues to move slowly to the northeast, at a rate of about 1 mm/day.

Due to the frequent ash clouds, the scientists continue to recommend that dust masks are worn in ashy conditions. The Tar River area remains very dangerous, and members of the public are strongly advised to stay out of the area. Further ash falls are to be expected.

Montserrat Volcano Observatory