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LEVEL OF CONCERN COLOR CODE: YELLOW
The rate of seismicity at Akutan Volcano this week is again
about half of that of last week. There are currently about 5-10 earthquakes per day, but most of these are too small to be felt by local residents. Although the threat of an imminent eruption has decreased, continuing seismicity indicates that the volcano remains restless.
The following scenarios are still considered possible:
(1) Earthquake activity continues to decrease, with some
fluctuations, and no eruption occurs.
(2) Earthquake activity intensifies leading to an eruption
of a lava flow from the flank, or within the summit caldera,
accompanied by small to medium sized ash plumes and explosions.
(3) Earthquake activity intensifies leading to an explosive
eruption accompanied by large ash plumes.
Data from five seismic stations near Akutan are transmitted in real-time to AVO. Based on the declining number of recorded earthquakes, AVO will discontinue around-the-clock staffing effective today. However, AVO continues to closely monitor the unrest at Akutan volcano using automated computer analysis, an alarm system, and frequent examination of seismic records.
COOK INLET VOLCANOES
Seismic activity at Spurr, Redoubt, Iliamna, and Augustine
volcanoes remains at normal background levels. We
maintain a computerized alarm system capable of notifying
AVO seismologists during non-business hours should unusual
seismic activity occur.