Alert levels raised at Okmok

The Alaska Volcano Observatory raised the Aviation Colour Code to Yellow and the Volcanic Alert Level to Advisory overnight for Okmok, the Aleutian volcano that erupted last summer. This is in response to the appearance of short bursts of volcanic tremor, which have been occurring at the rate of about one per over the past 24 hours. ‘This is the first sign significant seismic activity at the volcano since the cessation of eruption in August 2008’, notes the most recent AVO bulletin on Okmok, ‘and represents an increase above typical background activity’ (2009-03-02 21:05:29).

Yellow is the second-lowest level of the Aviation Colour Code system, and Advisory is the second-lowest level of the Volcano Alert Level system. Both indicate that ‘Volcano is exhibiting signs of elevated unrest above known background level’.

Information
Global Volcanism Program: Okmok – summary information for Okmok (1101-29-)
Alaska Volcano Observatory Okmok eruption page – Okmok information and updates from the AVO