Eruptions at a volcano in the Eastern Aleutian Islands are thought to have begun earlier than previously thought.
The Alaska Volcano Observatory said Friday the Bogoslof (BOH-goh-slawf) volcano sent an ash plume about 20,000 feet in the air in its eighth explosion detected since December 16.
He says most of the volcano's vent is underwater, which adds steam to ash plumes when magna is dislodged.
During an eruption of the volcano last week, the Federal Aviation Administration said flights were rerouted around the plume.
But no activity was observed in cloudy satellite images or recorded with infrasound data since yesterday and there has been no evidence of additional ash emission in the past day.
The volcano is located on an island of the same name in the Bering Sea about 850 miles southwest of Anchorage. Cloud-top temperatures from satellite suggest a cloud height of around 20,000 ft asl.
The volcano's current alert level is watch.
Bogoslof's last major eruption occurred in 1992 when a large new lava dome grew on the north side of Bogoslof Island, according to the Smithsonian Institution's Global Volcanism Program at the National Museum of Natural History.