Montserrat Volcano Observatory

Daily Report
Report for the period 6 pm 13 December
to 6 pm 14 December 1997

The volcanic activity is once again at a relatively low level, with rockfall signals being the dominant activity on the volcano.

Between 16:00 yesterday and 16:00 today, the broadband seismic network recorded 94 rockfall signals, 39 long period, 4 volcano-tectonic and 9 hybrid earthquakes. This activity is still consistent with continuing dome growth.

No good views of the dome were obtained today, although a steam and ash plume could be seen for most of the day by observers in Old Towne. Heavy rain this morning resulted in low amplitude tremor on some of the seismic stations; this was probably due to small mudflows in the ghauts on the side of the volcano.

A GPS survey of the network including Lees Yard, St. George's Hill, Old Towne and Waterworks was completed today. The data are currently being processed.

Dust levels in St. Johns, Woodlands and St. Peters today were low.

Although activity is still mainly focused on the southern side of the volcano, past experience as well as recent observations shows that the area of growth on the dome can change very quickly. Growth activity appears now to be backing up behind the major build-up of material in Galways, and rockfalls or pyroclastic flows starting to occur down Gages or Tar River in the near future would not be a surprise.

Montserrat Volcano Observatory