Montserrat Volcano Observatory

Morning Report
Report for the period 4 pm 27 July
to 7 am 28 July 1997

The alert level system has been revised by zones

Small to moderate sized rockfall signals have been the most common type of seismic signal recorded during the night. Two mudflow signals, one at 3:42 am and the other at about 6:00 am, were also recorded by the seismic stations. These signals lasted for about twenty minutes each and may have been due to mudflows in Fort Ghaut or the Belham Valley. Heavy steaming has been observed in the Belham Valley since daybreak. This is most likely due to the interaction of rain water with hot pyroclastic deposits in this valley. Heavy rainfall which began just after 3:00 am today has continued up to the present time and may cause further mudflows in the ghauts surrounding the volcano. Residents should stay away from the ghauts located on the flank of the volcano, particularly during this period of heavy rainfall.

Low cloud has prevented clear views of the volcano's summit this morning although a thick steam plume is clearly visible drifting to the west of the volcano.

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 the exclusion zone 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