Montserrat Volcano Observatory

Daily Report
Report for the period 16:00 10 May
to 16:00 11 May 1997
The current alert level is AMBER

Activity has been at a low level during the past 24 hours, with a continuation of rockfall and small pyroclastic flows from the dome, and some long-period earthquakes.

The broadband seismic network recorded 92 rockfalls, which is a slight increase since yesterday. There were also 28 long-period earthquakes, with 11 of these resulting in rockfalls. The rockfall signals were caused by activity in both the Whites River and Tar River. There were no volcano-tectonic earthquakes and 8 small hybrid earthquakes.

The visibility has been slightly better today than in recent days, but most of the dome remained hidden from view. A few small pyroclastic flows were observed from the south side of the dome, going down the south side of the Tar River valley.

A GPS survey was carried out this afternoon on the eastern side of the volcano, to double-check some measurements made yesterday.

A visit was made to Tar River this afternoon, to check equipment which has been installed to measure the temperature of the pyroclastic flow surges. A laser-ranging binocular survey of the Tar River valley was completed, using a new set of binoculars on loan to the MVO.

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