Activity at the Soufriere Hills volcano during this update period continued at about the same level and with a similar pattern as during the previous reporting period. Three periods of sustained, large-amplitude, low-frequency, near-harmonic tremor , which lasted about 60 to 90 minutes, were recorded at intervals of about 3 to 4 hours. These episodes of VTs and/or repetitive hybrid earthquakes and harmonic tremor are probably associated with magma migration from shallow depths to the surface as the process of dome growth at the Soufriere Hills volcano continues. Several small- to moderate-sized rockfalls also occurred and some of these were associated with small ash clouds.
Visibility was very poor during the early morning period although brief views of the dome from Bramble Airport Control Tower indicated it was steaming vigorously from several areas.
While the current phase of activity at the Soufriere Hills volcano continues, hazards in some areas of the evacuated zone have increased significantly. In particular, we expect significant-sized pyroclastic flows to occur more frequently in 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 now extremely hazardous, and should not be entered under any circumstances. If activity continues, there is a risk that flows or ash surges may come over Farrells' Wall and the upper reaches of some of the ghauts closest to the Tar River Valley. People are, therefore, advised not to work these areas. We also urge individuals who continue to ignore this advice to think very seriously before making trips to these highly hazardous zones.