The level of volcanic activity over the last twenty four hours has remained low.
Between 16.00 yesterday and 16.00 today there were 2 rockfall signals and 3 volcano-tectonic earthquakes. The rockfalls were observed during a helicopter observation flight. Both occurred down the south-west side of the dome.
Visibility of the summit was excellent this morning, with good observations of prominent spines on the summit. Theodolite measurements of the largest spine gave a height of 1027m, representing average growth of 16m in height in the last 8 days.
GPS data from Harris were processed with data from the University of Puerto Rico site at Hermitage. The Hermitage station has moved 17cm to the north-east since January 1997 of which 5cm of movement has occurred in the last eleven weeks. This represents a significant increase in the rate of deformation.
Dust levels were low at all sites apart from one site at Woodlands
Residents are reminded to remain alert and listen to ZJB radio.