America’s Volcanoes

The AVO Volcanic Activity Notice

AVO/USGS Volcanic Activity Notice

Volcano: Veniaminof (CAVW #1102-07-)

Current Volcano Alert Level: ADVISORY

Current Aviation Color Code: YELLOW

Issued: Friday, February 22, 2008, 12:27 PM AKST (20080222/2127Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A4
Location: N 56 deg 11 min W 159 deg 23 min
Elevation: 8225 ft (2507 m)
Area: Alaska Peninsula Alaska

Volcanic Activity Summary: Several minor bursts of ash from Veniaminof were observed on AVO Webcam images and recorded in seismic data this morning. The bursts rose less than 9,000 ft ASL (only a few hundred feet above the active intracaldera cinder cone), and were confined to the caldera.

AVO is raising the Aviation color code to Yellow and the Alert Level to Advisory.

AVO will continue to monitor activity at Mount Veniaminof using seismic data, satellite images, internet camera data and observer reports.

Recent Observations:
[Monitoring report] Sporadic increases in seismic activity have been noted since February 11, including bursts of tremor lasting 1-2 minutes occurring several times per hour. Seismic activity today includes events at the same times as the observed ash bursts. Several of the seismic events are stronger than those observed over the previous ten days, and are similar to signals observed during eruptions in 2005.

Hazard Analysis:
[General hazards] There are no indications that more vigorous activity is imminent or even likely. These small ash bursts are typical of activity at Veniaminof over the past several years. We expect that steam and ash emissions similar to those observed today may continue intermittently and could pose a hazard to people and low-flying aircraft in the vicinity of the active cone.

Venaminof daily update:

VENIAMINOF VOLCANO (CAVW #1102-07-)
56°11′52″ N 159°23′35″ W, Summit Elevation 8225 ft (2507 m)
Current Aviation Color Code: YELLOW
Current Volcano Alert Level: ADVISORY

AVO webcam images show that the active intracaldera cinder cone is emitting a constant steam plume with no ash bursts observed this morning. Intermittent low level seismic tremor continues.

There are no indications that more vigorous activity is imminent or even likely. Small ash bursts are typical of activity at Veniaminof over the past several years. We expect that steam and ash emissions to continue intermittently posing a hazard to people and low-flying aircraft in the vicinity of the active cone.

AVO will continue to monitor activity at Mount Veniaminof using seismic data, satellite images, internet camera data and observer reports.

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