Great Sitkin volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption would be accomplished using a combination of seismic, infrasound, lightning, and satellite data.
Jan 19, 2019 19:02 – Unrest continues at Great Sitkin volcano. No unusual activity was observed in seismic data today. A steam plume was observed in satellite data over the past 24 hours. No explosive activity was detected on a regional infrasound array on Adak Island.