Government Information Service

The Volcanic Explanation
For The 24 Hour Period Ending 7 AM On Tuesday January 07, 1997
A Presentation Of The Government Information Services
In Conjunction With The MVO.

Over the last 24 hours the October 1st dome (dome # 2) has continued to grow at a very rapid rate. There have been well over 100 rockfalls in the reporting period and some of these have led to pyroclastic flows.

Ash is being produced continuously and much of it is being blown westwards over the Plymouth area. Scientists believe that there is every likelyhood of a major collapse of the dome over the near future as its flanks are becoming more unstable.

Visibility during yesterday (Monday) was moderate and views from the helicopter showed that there was continuous rockfall and ash production.

The seismic activity was dominated by the rockfall signals for most of the recording period but there were also four hybrid events recorded.

Some EDM measurements were taken on Monday on the northern triangle. Results show no significant change from the previous measurement.

Water, ash and gas samples were taken yesterday as part of the routine environmental measurements, they are currently being analysed.

The alert level remains at ORANGE.

Government Information Service