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ARCHIVED REPORT
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Makushin



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.

VOLCANO ALERT LEVELS
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.

AVIATION COLOR CODES
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].

PDF version of these definitions
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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
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