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On June 29, several pilot reports of volcanic activity were logged by the Federal Aviation Administration today. Reports indicated that a steam and ash plume was erupting from the active cone in Veniaminof caldera. Initial reports stated that a plume was rising from the vent to an altitude of 12,000 feet above sea level and extending 15 to 20 miles downwind in a southwesterly direction. The plume was described as being dark-gray near the summit of the mountain and becoming wispy at some distance away. AVO scientists detected a weak ash plume on AVHRR satellite images of Veniaminof. By the morning of June 30, no further eruptive activity was observed by pilots. A "warm" spot, detected on satellite images, has persisted throughout this past week. This type of activity is typical of recent eruptions at Veniaminof.
No new observations of activity from Kanaga were received this week.
No new observations of activity from Cleveland were received this week.
COOK INLET VOLCANOES
A large seismic event occurred at Iliamna Volcano at 1:40 AM ADT on June 30. The form of the signal indicated that the source was an avalanche, and this was confirmed by a pilot report today. Seismic activity at Spurr, Augustine and Redoubt 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.