USGS Raises Volcano Alert Level in Mt. Gareloi Due to Increased Seismic Activity

The aviation color code and volcanic warning level of Mount Gareloi stratovolcano, the westernmost volcano in the United States, have been elevated by the USGS and its Alaska Volcano Observatory (AVO). AVO elevated the aviation color code to YELLOW and the Volcano Alert Level to advisory yesterday due to increased seismic activity at the volcano above background levels.

Aviation Codes and Volcanic Activity Alert Levels are issued by the AVO. Green, yellow, orange, or red is the many types of aviation codes. When ground-based monitoring fails to show that a volcano is operating at an average background level of activity, it is simply designated as "unassigned."

Yellow indicates that a volcano displays high unrest symptoms above known background levels, whereas green indicates usual activity associated with a non-eruptive condition.

When a volcano shows increasing or growing unrest with an elevated risk of eruption, the color changes to orange. Finally, the code becomes red when an eruption is imminent, with large volcanic ash emissions predicted in the atmosphere or when an eruption is underway. Large volcanic ash emissions are predicted in the atmosphere. The activity of Volcanoes Normal, advisory, watch, or warning alert levels are available.

If data is lacking, it is simply classified as "unassigned," as with aviation codes. It is deemed normal when the volcano is operating at normal background levels in a non-eruptive condition.

An advisory is issued if the volcano shows evidence of heightened disturbance above the background level. A watch is issued when a volcano shows signs of increased or growing disturbance, whereas a warning is issued when a dangerous eruption is imminent.

Local Seismic Network

A local seismic and infrasound network, satellite data, and regional infrasound and lightning-detection networks all keep an eye on Gareloi. In addition, AVO says they'll keep an eye on things to see if the latest changes are due to a fresh intake of magma or other changes in the magma system. If an eruption looks to be impending, the aviation and alarm codes will be raised correspondingly.

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