© Lynda Lybeck-RobinsonA plume rises from Bogoslof volcano, partially obscured by a mountain on Unalaska Island, in this view from Unalaska, about 60 miles east of the volcano, on Wednesday, Dec. 22, 2016.
Observatory volcanologist Robert McGimsey says Wednesday afternoon's eruption of the Bogoslof volcano was "almost a carbon copy" of an eruption 24 hours earlier.
He tells The Associated Press that both eruptions prompted the highest alert level and both were downgraded hours after the events.
Tuesday's eruption sent ash and steam 34,000 feet into the air, while Wednesday burst went 1,000 feet higher. Officials say both volcanic explosions were also short-lived.
The observatory said early Thursday that it was reducing the alert level because there had been no recent volcano activity.
The volcano is located on an island of the same name in the Bering Sea about 850 miles southwest of Anchorage.
Source: AP
Comment: The last recorded eruption of Bogoslof was in 1992. The Aleutian Islands, with their 57 volcanoes, are in the northern part of the Pacific Ring of Fire, a region prone to frequent earthquakes and volcanic eruptions.