Montserrat Volcano Observatory

Morning Update
Report for the period 19:00 12 August
to 07:00 13 August 1996

Activity at the Soufriere Hills during the night was dominated by small- to medium-sized rockfalls from the flanks of the growing lava dome. Its level was similar to that observed during most of the previous reporting period. A large continuous broadband signal recorded on the Gages seismic station from around 06:10 and which lasted about 30 minutes was due to flash flooding in Fort Ghaut. Several small hybrid earthquakes and a few episodes of intermittent low-amplitude broadband tremor were also recorded.

Visibility during the early morning period was very poor, with the volcano obscured by low clouds and rain.

People in areas affected by recent ashfalls should exercise great care when driving and should wear dust masks.

Further rockfalls and pyroclastic flows will occur but all indications at the moment are that these will be confined to the Tar River Valley area. These will obviously be associated with ash clouds which will be blown on the wind, with areas affected by ashfall being determined by the wind direction and strength at that time. The Tar River Valley and surrounding areas are extremely hazardous and should not be entered under any circumstances.

Montserrat Volcano Observatory