Seismic activity during this period was similar to that during the previous 24 hours. It was characterised mainly by the occurrence of rockfalls, hybrid and long period events. A total of 6 long period events were recorded while the small hybrid events were generally recorded only by the seismic stations at Gages and Chances' Peak. One volcano-tectonic earthquake of magnitude 2.5 occurred in the Woodlands Bay area at a depth of about 7 km.
The eastern EDM triangle was measured today. The Long Ground to Castle Peak line showed a small and insignificant change of 1 mm since yesterday, continuing the trend observed over the past several days.
Visual observations of the volcano were made today 28 March in relatively good viewing conditions from the Helicopter and White's EDM instrument station. The only major change in the Crater region seems to have been the collapse of the tall spine which was extruded from the eastern part of the dome about three days ago. The collapse of this spine was probably responsible for the large ash cloud observed at 1725 on 27 March. The major areas of dome growth are still in the eastern and western sectors.
Members of the public are still strongly advised to keep out of the Tar River Valley area.