Advisory alert on Alaskan Volcano

The Alaska Volcano Observatory (AVO) has issued an "advisory" alert following recent activity in the Cleveland Volcano, which is located directly below the flight path of commercial airlines flying between North America and Asia.

An advisory alert is issued when a volcano exhibits signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity decreases significantly but continues to be closely monitored for possible renewed increase.

The AVO has been monitoring elevated thermal emissions over the past week, which are relatively common at Cleveland and do no necessarily indicate an imminent eruption. There has been no evidence of ash emissions or eruptive activity.

However, without a real-time seismic network at Cleveland, the AVO is unable to track local earthquake activity related to volcanic unrest. Short-lived explosions with ash clouds that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery for hours.

While low-level ash emissions at Cleveland occur frequently and do not necessarily mean a larger eruption is imminent, the AVO continues to monitor the volcano using satellite imagery.

Since releasing a 12km high plume in 2001, the Cleveland Volcano has been active regularly over the past six years, although the plumes have not exceeded 8km.

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