2008 Kasatochi Earthquake Swarm

On August 6, 2008, a vigorous seismic swarm was detected in the vicinity of Kasatochi volcano in Andreanof Islands. The largest earthquake, magnitude 5.8, occurred about 27 hours into the sequence and about 3.5 hours before the first aerial ash discharge from Kasatochi was detected by the Alaska Volcano Observatory through satellite data.This discharge was followed by two more explosions, also detected via satellite monitoring. The 3rd explosion consisted of nearly continuous ash emissions and declined in frequency and intensity through ~22:00 UTC on August 8.