Montserrat Volcano Observatory

Morning Update
Report for the period 19:00 14 August
to 07:00 15 August 1996

Activity at the Soufriere Hills during the night continued at about the same level as that observed during the previous reporting period. Signals indicative of small- to moderate-sized rockfalls from the flanks of the growing lava dome dominated the seismic records. A few of the largest rockfalls may have been associated with small pyroclastic flows in the Upper reaches of the Tar River Valley. Several small volcano-tectonic and hybrid earthquakes were also recorded. Intermittent low-amplitude broadband tremor was recorded at the stations closest to the Crater throughout the update period.

Visibility during the early morning period was very poor, with the dome covered by low clouds.

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