The volcano alert level to “Advisory”
The Alaska Volcano Observatory has changed the volcano alert level to “Advisory”, with an aviation code level of Yellow. The decision is due to changes in gas emission and heat output. However, there is no indication that an eruption is imminent.
Starting in July, field crews working near the volcano summit smelled hydrogen sulfide gas. So did a pilot in September. Satellite images taken on October 13th showed increased warming.
There has been a modest increase in low-frequency earthquakes, suggesting that if new magma has entered the volcanic system, it is still deep. The main risks at this time are from steam explosions on the summit, noxious gas plumes, ice and rock avalanches on Drift Glacier, and increased water flow on Drift River.
Redoubt last erupted in the winter of 1989-90. AVO crews are monitoring the volcano closely and will install more geophysical equipment and a Web camera.
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