Montserrat Volcano Observatory

Daily Report
Report for the period 16:00 13 December
to 16:00 14 December 1996
The current alert level is ORANGE

The situation at the volcano has not changed during the last 24 hours. The new dome probably continues to grow, although it has not yet generated significant rockfalls or pyroclastic flows. Galway's Wall is still deforming. The risk of a sudden failure of the wall remains high. 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, although residents should stay alert as conditions could change suddenly.

Visibility was poor today, and it has not been possible to confirm that the new dome continues to grow. It probably does, since a field party on Chances Peak today experienced light ash fall.

Measurements were made on the two large cracks on Chances Peak. They continue to grow, although at a reduced rate. The most likely cause of these cracks is the deformation of Galway's Wall.

Seismicity was very low during this reporting period. No volcano-tectonic earthquakes were recorded. One small dome rockfall and two long-period events were recorded. No major landslides on the Galway's Wall were detected by the seismic network.

The latest estimate of the volume of the new dome is 500,000 cubic metres. Extruded over a period of two to three days, this represents an extrusion rate comparable to the initial extrusion rates of the October 1 dome.

GPS measurements were made on stations on the eastern side of the volcano. The data is still being processed.

Dr. Sayyadul Arafin and Mr. Lutchman Pollard from the Seismic Research Unit took up duties at MVO today. Anthony Langlais from the Office of Maritime Affairs in Guadaloupe also arrived today. He will be facilitating communications with Guadaloupe.

Montserrat Volcano Observatory