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A small steam and ash cloud from Makushin volcano was reported by Coast Guard C-130 pilots at 12:46 pm AST on Monday, January 30. The cloud rose to 8000 ft. and was carried northeast from the volcano. Several pilots reported a diminishing light brown ash plume from Makushin during the next hour, and all activity apparently subsided shortly thereafter. A satellite image recorded at 1:45 pm AST, showed no sign of eruptive activity. The National Weather Service issued a SIGMET that ran until 5 pm AST.
Makushin is a broad, ice-topped sratovolcano, 2036 m high, located on the northwest end of Unalaska Island, 250 km south-southwest of the tip of the Alaska Peninsula. A breached summit caldera, about 3 km across, contains a small cinder cone, eroded remnants of other cones, and several fumaroles. Although the volcano has been reported active since its discovery in 1763, no major eruptions have occurred since 1826. Minor steam and ash bursts are frequent and typical eruptive activity at Makushin.
COOK INLET VOLCANOES
Seismic activity at Spurr, Augustine, Redoubt and Iliamna
volcanoes remains at normal levels.
The Alaska Volcano Observatory continues to seismically
monitor Spurr, Augustine, Redoubt and Iliamna volcanoes.
We maintain a computerized alarm system that is capable of
notifying AVO seismologists during non business hours
should unusual seismic activity occur.