As many as 150 lava avalanches traveled a maximum of 2 km mostly down the Bebeng drainage on the SW flank.
Strombolian activity was first observed on 17 April; that same day that sulfur dioxide emissions increased to 181.
The closest seismic station to the volcano was on Sitka, 24 km E; both the and remained at Unassigned due to the lack of dedicated, local instrumentation.