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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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KANAGA VOLCANO



Intermittent, low-level eruptive activity continues at Kanaga Volcano in the Central Aleutians. Yesterday, pilots and ground observers reported a vigorous steam plume containing minor ash extending above the volcano to an estimated 10,000 feet (3050 m) ASL. Local winds carried the plume north to northeast from Kanaga and light ashfall occurred on the flanks of the volcano. Satellitel images detected a warm spot located at Kanaga as well as a faint plume headed north, consistent with pilot reports.



Eruptive activity at Kanaga has been ongoing since late December, 1993; in general, the activity is characterized by occasional eruptions of dilute ash, volcanic gas and steam plumes that have risen to a maximum of about 10,000 feet (3050 m) ASL. Based on what is known about the recent eruptive history at Kanaga, this type of mild but persistent emission of small plumes could continue for many months. The most significant historic eruption of Kanaga, in 1906, produced a series of lava flows down the volcano's flanks; while lava effusion has not yet occurred during the current eruption of Kanaga, it remains a possibility.



The community of Adak 20 miles (33 km) east of the volcano has reported no significant ashfall throughout this period. AVO maintains no seismometers on Kanaga. The AVO monitoring effort consists of satellite surveillance and collection of pilot and ground observer reports.



VENIAMINOF



Poor weather obscured Veniaminof Volcano during the past week.



COOK INLET VOLCANOES



Seismicity at Spurr, Augustine, Redoubt and Iliamna

volcanoes remains at normal levels.



The Alaska Volcano Observatory continues to monitor Spurr,

Augustine, Redoubt and Iliamna closely. We maintain a

computerized alarm system that is capable of notifying AVO

seismologists during nonbusiness 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
Contact Information: AVO Web Team

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