Tanaga volcanoes viewed from Hot Springs Bay on 11 June, 2021 (image: AVO)
The Alaska Volcano Observatory (AVO) recorded a swarm of small earthquakes in the vicinity of the volcano over the past few days.
An increasing trend of the activity peaked with intensified quakes during the past 24 hours. Volcano-tectonic earthquakes were located at shallow depths between 3 and 6 km, of which the largest was recorded with magnitude M 2-3. Earthquakes likely reflected magma intrusions and migration under the surface.
Therefore, the local observatory made decision to rise the Aviation Color Code and Volcanic Alert Level to Yellow.
Source: Alaska Volcano Observatory volcano activity update 19 November 2022