Shishaldin Activity - Color Code YELLOW : Alert Level ADVISORY

Clouds obscured Shishaldin from satellite views today. Seismicity at Shishaldin is unchanged over the last 24 hours and tremor continues. No visual reports have been received.
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Clouds obscured Shishaldin from satellite views today. Seismicity at Shishaldin is unchanged over the last 24 hours. No visual reports have been received.
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Clouds obscured Shishaldin from satellite views today. Seismicity at Shishaldin is unchanged over the last 24 hours. No visual reports have been received.
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Clouds partly obscured Shishaldin from satellite views today. Seismicity at Shishaldin is unchanged over the last 24 hours. No visual reports have been received.
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Clouds obscured Shishaldin from satellite views today. Seismicity at Shishaldin is unchanged over the last 24 hours. No visual reports have been received.
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Satellite views from yesterday evening continue to show a thermal anomaly. Seismicity at Shishaldin is unchanged over the last 24 hours.
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AVO raised the Aviation Color Code and Volcano Alert Level to YELLOW/ADVISORY this week based on a persistent thermal anomaly over the volcano's summit and an increase in seismicity over the last several months. Subsequently, pilots and residents of Cold Bay report a vigorous vapor plume issuing from the volcano. There have been no observations of ash and seismicity is largely unchanged this week.

Although detection of a thermal anomaly is rare at this volcano, it is not certain that this unrest will lead to an eruption. A thermal anomaly was observed in the months leading up to the last significant eruption at Shishaldin in 1999; this fact, combined with the likelihood that an eruption at Shishaldin could occur with little or no seismic precursors, drove AVO's decision to raise the Color Code and Alert Level.


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A weak thermal anomaly persists in satellite views of Shishaldin Volcano. Seismicity remains unchanged. Yesterday, AVO received a pilot report and observations from Cold Bay describing a vigorous vapor plume from the summit. This activity is considered typical for Shishaldin.
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