Seismic activity during today was dominated by persistent moderate amplitude broadband tremor recorded at the Gages station for most of the day. The tremor which began at about 15:00 yesterday, 4 March, built up on the Gages station to peak at about 08:00 this morning, 5 March. It then subsided until about 15:00 this afternoon when it restarted. This tremor was not recorded elsewhere on the network except at a very low level on the Chances Peak station. Rock fall events continue to be recorded on the Chances Peak station at a similar rate to the past few days, with small events every few minutes and larger ones every 10 to 20 minutes. Some of the long period seismic signals normally associated with rock falls have a sharp onset which may indicate a small explosive event triggering the rock falls.
No EDM measurements were made today due to persistent low cloud over the volcano.
A helicopter observation flight during the late afternoon of 4 March enabled brief views of the crater area; no drastic changes in any visible parts of the dome were noted.