Infrasonic Recordings of Strombolian Eruptions of Erebus, Antarctica, March – December 1984, Covering the Jump in Activity on 13 September 1984

Continuous infrasonic recordings made at Windless Bight, 26 km from the summit crater of Erebus, between March and December 1984, show an abrupt change both in the average interval between explosions and in the maximum infrasonic amplitudes on 13 September. Before the change the average interval was 2.8 days, and the maximum infrasonic amplitude was 6.3 microbar peak, and afterwards the average interval was about 1.5 h, and the maximum amplitude on 17 September was 32 microbar peak. From 13 September to 8 December, when activity ceased for 13 days, about 1000 explosions occurred.