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The level of seismicity beneath Mt. Spurr remains low. A brief period of anomalous seismicity occurred late last Friday afternoon prompting an observation flight to the volcano on Saturday. Measurements of SO2 emissions were at background levels, CO2 was slightly above background, and hydrogen sulfide was detected. No unusual activity or signs of activity were observed in the crater. The current level of concern color code is GREEN.
Steam and ash explosions could still occur at Crater Peak with little if any advance warning. Such explosions are unlikely to pose a hazard to high-flying aircraft or to communities downwind. AVO continues to recommend that climbers, hikers, and other interested parties stay out of the crater until further notice.
OTHER COOK INLET VOLCANOES
Seismicity at Augustine and Redoubt volcanoes remains at
normal levels. During the recent period of clear, sunny weather, steam plumes have been visible from Redoubt, Iliamna, and Augustine volcanoes, which is typical during spring breakup.