Intermittent periods of low to moderate broadband tremor continues to be observed on the seismograph station at Gages. There was a slight increase in amplitude of this broadband tremor observed at around 09:00 on 19 February. This increased level is still being observed at the end of the period currently under review. Several other seismic signatures, of the type associated with rockfalls or small eruptions, were also observed during the review period. The largest of these signals occurred at 20:22, 21:24, 21:33 and 21:48 on 18 February and at 04:46, 07:32, 07:39 and 08:09 on 19 February. Four of these rockfalls were detected on the seismograph stations at Long Ground and Windy Hill in addition to those at Gages and Chances Peak.
EDM measurements were made on the Amersham-Dagenham, Amersham-Amersham and Amersham-Chances Peak lines today. These lines have shortened by less than 5 mm since they were previously occupied on 5 January. Favourable weather conditions allowed angular measurements to be made on the northern part of the dome from Plymouth.
Visual observations were made from Chance's Peak during the morning of 19 February. Active rock fall was occurring almost constantly from the western part of the dome where growth is currently most active and a tall spine was noted within this active area of growth. Growth of the whale-back feature also appears to be continuing in the southeastern part of the crater. Steam and gas production continues to be very high from the crater area.