Montserrat Volcano Observatory

Daily Report
Report for the period 6 pm 4 December
to 6 pm 5 December 1997

Seismicity has remained at a relatively low level today with mainly rockfall signals being recorded.

Between 16:00 yesterday and 16:00 today there were 24 long-period earthquakes, 104 rockfall signals, 7 hybrid earthquakes and 2 volcano tectonic earthquakes. The northern lobe of the October 22nd dome was seen today and did not appear to have changed since it was last seen yesterday. Only a few of the rockfalls were being generated from this portion of the dome. Rockfall activity in the Galways area is fairly continuous. This is still where the active growth is concentrated. Although activity is still mainly focused on the southern side of the volcano, past experience has shown that the area of growth on the dome can change very quickly and pyroclastic flows could occur down any of the ghauts around the volcano with little or no warning.

Average dust levels over the last 24 hours in St. Johns, St. Peters and Woodlands were low.

Electronic Distance Measurements made on the Old Towne, Garibaldi Hill and Lees triangle yesterday are still being processed.

Montserrat Volcano Observatory