The level of activity at the Soufriere Hills during the night was the same as that observed during the previous reporting period. The activity was dominated by the occurrence of small- to medium-sized rockfalls from the flanks of the growing lava dome. A sequence of several small volcano-tectonic earthquakes was recorded during the period 20:00 to 21:00 on 13 August. Intermittent low-amplitude broadband tremor was recorded at the stations closest to the Crater throughout the update period, with the most persistent episode between 19:41 and midnight of 13 August.
Visibility during the early morning period was very poor, with the volcano obscured 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.