The bands of seismic tremor that have been seen since 22 December continued overnight, with no reduction in size. The period between the peaks in the tremor has shortened to about five hours. This type of tremor activity has been seen before, prior to dome collapse and pyroclastic flow generation between late July and mid-September. Large dome collapses have led to explosive eruptions in the past, and Montserratians are asked to listen to Radio Montserrat and stay alert.
Observations last night showed that there was rockfall activity from all of the eastern face of the October 1 dome. There was one small pyroclastic flow that travelled past the Tar River Soufriere. This generated a moderate sized ash cloud and there was ashfall in the Plymouth area.