Montserrat Volcano Observatory

Morning Report
Report for the period 4 pm 12 July
to 7 am 13 July 1997

The alert level system has been revised by zones

Activity at the volcano has been at about the same level since yesterday. Rockfalls and small pyroclastic flows were the only type of events recorded by the seismic stations. There were several small ash eruptions and pyroclastic flows which occurred during the late evening and throughout the night. These produced small ash clouds which did not reach more than 5,000 ft and drifted over Gages and towards the east. Rockfalls and small pyroclastic flows continue to occur at any time with no clear correlation with the Chances Peak tiltmeter which now shows no obvious cyclical behaviour.

The volcano is overcast early this morning and no views were obtained of the summit, but the cloud appears to be clearing sporadically so brief glimpses might be possible later in the day. Reports of glowing over Gages were received early this morning, and confirms earlier observations that most of the dome growth is concentrated over Gages at the present time.

People are reminded that mudflows can be extremely hot if recent deposits are remobilised by heavy rain. The current area of activity in the crater still 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