Montserrat Volcano Observatory

Morning Report
Report for the period 4 pm 4 July
to 7 am 5 July 1997

The alert level system has been revised by zones

Activity at the volcano since yesterday has been lower than over the previous days, with rockfalls being the main phenomena recorded by the seismic network. Some small pyroclastic flows down Mosquito Ghaut occurred from 8 pm to 9.30 pm, and glowing clouds were observed to the north of the volcano. Since 9.30 pm the volcano has been relatively quiet, although a hybrid swarm started at about 6.00 am.

The tiltmeters on Chance's Peak continue their cyclic pattern although the peak associated with the pyroclastic flow activity last night was not very well defined. However, the tilt is increasing more rapidly at the time of reporting indicating that further pyroclastic flow activity could be expected in the next hour or two.

People are reminded that hot mudflows can be extremely hot if recent deposits are remobilised by heavy rain. The current area of activity in the crater makes Mosquito Ghaut and Gages the most likely pathways for pyroclastic flows and surges, but further flows in Tuitt's or Tar River are possible. The Belham River valley is also dangerous and should not be entered. Access to Plymouth is completely restricted, and people should stay completely away from the flanks of the volcano. Everyone should continue to stay alert, and listen to Radio Montserrat for any announcements.

Montserrat Volcano Observatory