Government Information Service

The Volcanic Explanation
For The 24 Hour Period Ending 7 AM On Tuesday March 25, 1997
A Presentation Of The Government Information Services
In Conjunction With The MVO.

The current alert level is AMBER

The activity at the Soufriere Hills Volcano has once again been at a low level for the last 24 hours. There were just 2 volcano-tectonic and 3 hybrid earthquakes plus 11 long period earthquakes during the reporting period. There have been over 20 small to moderate rockfall signals during the same time period.

Over the last few days the dome has been clear and observations continue from the helicopter. The evenings have allowed some views of the incandescent summit of the January dome and there has also been some glowing of the pre-September material and on the area above Galways Wall. In the region of the wall there is a lot of new debris which has been shed from this very active area.

Some COSPEC measurements were carried out yesterday (Monday) to see how much sulphur dioxide in the atmosphere, results will be published later. Also yesterday the crack on Chances Peak was measured, results show that side of the crack has sheared south-westwards by 3.4 centimetres since the begining of the month.

Last weeks survey by sea of the delta below Tar River Valley shows that the current volume above sea level is 15.5 million cubic metres (this about one third of the size of the current dome).

The dome is very large, still growing and is unstable. There may be collapses in the very near future so residents are asked to remain vigilant.

Government Information Service