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POSSIBLE SMALL ERUPTION FROM KANAGA VOLCANO
On Monday, June 19, the National Weather Service received a pilot report of a possible small ash eruption from Kanaga Volcano in the Aleutian Islands. The pilot observed a weak plume rising approximately 1,000 feet over the volcano's 4,287-ft summit. He also described possible fresh ash or bare ground due to snow-melt on the west side of the volcano. Yesterday morning, a U.S. Fish and Wildlife biologist in an aircraft on approach to Adak glimpsed the volcano and observed a dirty haze or plume at an elevation level no higher than the summit. The plume extended approximately 25 km south from Kanaga. In contrast to other snow-covered peaks nearby, the upper flanks of Kanaga appeared dark due to ash fall and/or melting of the seasonal snow cover. AVHRR satellite images analyzed by AVO earlier this week showed no significant thermal anomalies or evidence of plumes of any kind. However, an image from 11:00 am ADT today showed a steam plume extending approximately 180 km northward from the summit of Kanaga. A weak thermal anomaly accompanies this steam plume.
An intermittent, low-level eruption occurred at Kanaga Volcano from January through mid-October, 1994. Although summit steam plumes have persisted since then, reports of this week suggest either renewed, low-level eruptive activity or 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.