There has been another earthquake swarm overnight, followed by an episode of volcanic tremor. This activity continues the pattern established over the last two weeks. The swarm started at around 9 pm last night, and finished at 3:20 am. The swarm was composed almost entirely of volcano-tectonic earthquakes, some of moderate size. The swarm was followed by a period of quiet, with some hybrid earthquakes, and then a tremor episode started at 6:30 am. This tremor is ongoing.
A short burst of higher-amplitude seismic activity at 6:50 am could have been a small pyroclastic flow. A team of MVO observers at the airport could not see any activity because of the low cloud.
The eastern side of dome is still steep and unstable, so that further pyroclastic flows could occur with little warning. Residents are therefore reminded to remain alert and responsible at all times. This includes traveling with an ash mask, spending the minimum possible time in the evacuated zone and being prepared to take recommended action when advised. The Tar River and upper Galway's areas are extremely dangerous, and should not be entered under any circumstances. Zone E, which includes Corkhill and the airport, remains safe at this time.