Government Information Service

The Volcanic Explanation
For The 24 Hour Period Ending 4 PM On Tuesday July 15, 1997
A Presentation Of The Government Information Services
In Conjunction With The MVO.

The alert level system has been revised by zones.

The level of activity is about the same as yesterday.

No views of the volcano were seen today (Tuesday) due to the overcast weather. New pyroclastic flows were seen in Mosquito Ghaut, Gages Valley and over Galways Wall were seen during a helicopter flight. The flow that occurred on July 13 reached to just above Gages Village. The more recent flow stopped at Gages Lower Soufriere.

There were 64 rockfall signals, 1 long-period earthquake, 1 hybrid earthquake and no volcano-tectonic earthquakes recorded.

The EDM line between Waterworks and Lees Yard still does not show a consistent trend. Again the Chances Peak tiltmeter continues to show a deflationary trend, with no other changes.

It is probable that the dome continues to grow above Gages Wall, and Mosquito Ghaut even with the low seismic activity and large pyroclastic flows could flow into the Central Corridor and Plymouth.

The recent pyroclastic flows and ash eruptions have not been associated with an increase in seismicity or tiltmeter readings. Anyone entering the exclusion zone is at great risk. Further pyroclastic flows are most likely to occur in Mosquito Ghaut and Gages Valley but pyroclastic flows could also occur in Tuitts, Tar River Valley and White River. There has been no warning of the pyroclastic flows in Gages Valley and this makes Plymouth very dangerous. Belham River Valley could be the sight of pyroclastic surges or hot mudflows. These mudflows are at or near boiling point and travel very fast and may go further than pyroclastic surges.

Dr. Rick Hoblitt of the US Geological Survey left today and Mr. Chandrapath Ramsingh arrived today of about a month.

Government Information Service