Montserrat Volcano Observatory

Daily Report
Report for the period 16:00 14 December
to 16:00 15 December 1996
The current alert level is ORANGE

The situation at the volcano has not changed during the last 24 hours. The new dome continues to grow and the dangers from the volcano are still extremely high. A sudden failure of Galway's Wall could have disastrous consequences for much of the evacuated zones. Nobody should enter zone A/B on the revised risk map as it is extremely dangerous. Visits to zone C/D should be limited. Zone E remains safe at this time.

Visibility was excellent in the later part of the day and several inspections of the new dome and Galway's Wall were carried out. The new dome is growing quickly and the top is now higher than the October 1 dome, perhaps 910 m above sea level. Growth appears to be along a linear structure oriented east-south-east.

Measurements were made again today on the two large cracks on Chances Peak. The cracks have moved again since yesterday, in a fashion consistent with deformation of the Galway's Wall. The cracks on Galway's mountain also appear to have enlarged.

Seismicity was very low during this reporting period. No volcano-tectonic earthquakes were recorded. Three dome rockfalls and four long-period events were detected by the seismic network. Two of the rockfalls were at around 6 am this morning and generated light ashfall in the Rileys area. No major landslides on the Galway's Wall were detected by the seismic network.

No GPS or EDM measurements were made today.

Mark Davies of the Open University, UK, arrived yesterday to take up duties at MVO. Rick Hoblitt and Randy White from the United States Geological Survey arrived today for a month-long stay.

Montserrat Volcano Observatory