The Alaska Volcano Observatory (AVO) has lowered the alert levels for two Aleutian volcanoes.
Bogoslof is back at the intermediate "watch" level, following a powerful eruption Tuesday night.
The volcano hasn’t produced ash since that three-hour blast and its seismicity has died off, but scientists say Bogoslof could blow again with little warning.
Meanwhile, Cleveland Volcano -- 45 miles west of Nikolski -- has been quiet since a small eruption last month.