Montserrat Volcano Observatory

Daily Report
Report for the period 16:00 07 May
to 16:00 08 May 1997
The current alert level is AMBER

The level of volcanic activity has remained about the same. There was a swarm of volcano-tectonic earthquakes overnight, but otherwise the activity has been similar to the last few weeks, with rockfalls and long-period earthquakes.

The volcano-tectonic earthquake swarm lasted from 10:02 pm to 7:56 am, and consisted of 28 earthquakes. The largest earthquakes were located at a depth of 3-5 km beneath the crater. The seismic network also recorded a total of 74 rockfall signals during the past 24 hours, about the same amount as yesterday. There were 23 long-period earthquakes, of which 9 triggered rockfalls.

Good views of the dome were possible during a few clear periods today, but no major changes to the dome were seen. Observations of the volcano were made from the eastern side and from the Galway's observation post. Dome growth continues in the summit area, and some bouncing boulders were observed descending the south-eastern side of the dome. A few of the larger rockfalls were heard, and produced some ash.

An EDM survey was carried out on the northern triangle today. The very slow outward and downward movement of the Farrell's site continues.

A visit was made by helicopter to the Galway's area today, to retrieve camera equipment installed close to the Galway's Wall. This equipment will be reinstalled at the new observation post, on South Soufriere Hills, where it will be less susceptible to ash fall.

The volcano remains dangerous, and only essential visits should be made to the evacuated zone. People should wear masks when in the ashy areas. The Tar River and White River valleys are extremely dangerous, and should not be entered under any circumstances.

Montserrat Volcano Observatory