A new short-lived (1-2 minutes) explosive eruption started at the volcano at 21:04 local time (05:04 UTC) and the activity is still continuing at the time of this update as confirmed by geophysical data.
Mariner observations suggest an ash plume height of about 15,000 ft (4,600 m) as well as confirmed by Volcanic Ash Advisory Center (VAAC) Anchorage. The plume continues to dissipate towards the east.
The eruption was preceded by an elevated volcanic-seismic unrest and over the past day.
In addition, an elevated surface temperatures and sulfur dioxide (SO2) emissions were detected during the past week.
The Alaska Volcano Observatory (AVO) raised the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH.
Source: Alaska Volcano Observatory volcano activity update 7 October 2021