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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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KANAGA VOLCANO



AVO received a report from the U.S. Navy Meteorologic Office in Adak this morning of a dilute ash cloud rising about 30-60 m (100-200 ft) over the summit of Kanaga Volcano in the Aleutian Islands. The crew of a U.S. Coast Guard C-130 described the could as "thin" and drifting north. They noted a light dusting of ash on the volcano and three active steam vents on the south flank. Ground-based observations from Adak, 40 km (25 mi) east of the volcano are prevented this morning by low clouds. This appears to be a continuation of activity reported earlier in the week. On Monday the National Weather Service received a similar report of a weak plume rising approximately 330 m (1,000 ft) over the volcano's 1307 m (4,287 ft) summit and possible fresh ash on the west side of the volcano. On Tuesday, a U.S. Fish and Wildlife biologist observed a dilute ash plume extending approximately 25 km (15 mi) south from Kanaga. AVHRR satellite images analyzed by AVO earlier this week showed no significant hot spots in the vicinity of the volcano, however a small steam plume was spotted on a Wednesday morning image and possible on a Thursday evening image.



An intermittent, mildly explosive eruption accompanied by lava extrusion within the summit crater occurred at Kanaga Volcano from January through mid-October, 1994. Although summit steam plumes have persisted since then, reports of this week suggest renewed, low-level eruptive activity or, alternatively, especially vigorous steaming associated with cooling of lava in the summit crater.



AVO will continue to monitor the situation through analysis of satellite imagery and compilation of both air- and ground-observer reports.



MOUNT VENIAMINOF



Residents of Perryville again report a small steam plume above the summit caldera of Veniaminof volcano this

morning. A hot spot was detected on AVHRR images of the volcano earlier this week. Veniaminof has been the site of a low-level intracaldera eruption since July, 1993; steam clouds generated by the interaction of lava with ice and snow and occasional low-energy ash bursts may continue for some time.



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 nonbusiness hours,

should unusual seismic activity occur.







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 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].

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Page modified: May 27, 2014 10:23
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