ANCHORAGE, Alaska April 30, 2025 — Mount Spurr, an 11,070-foot stratovolcano situated approximately 80 miles west of Anchorage, is currently exhibiting signs of heightened volcanic activity. The Alaska Volcano Observatory (AVO) has maintained the volcano’s status at Advisory (Yellow) since October 2024, indicating elevated unrest above normal background levels.
Increased Seismic Activity and Gas Emissions
Since April 2024, AVO has recorded over 3,400 earthquakes beneath Mount Spurr, with weekly counts exceeding 100 events. Most of these earthquakes are shallow, occurring less than 2.5 miles below sea level, and have magnitudes up to 2.7. Additionally, ground deformation measurements indicate outward movement of approximately 2.6 inches at the closest GPS station, suggesting magma intrusion beneath the volcano.
Gas emission studies conducted in March 2025 revealed significantly elevated levels of sulfur dioxide and carbon dioxide, particularly at the summit vent. Sulfur dioxide emissions were measured at approximately 450 metric tons per day, a substantial increase from less than 50 metric tons recorded in December 2024.
Potential Hazards and Preparedness Measures
An eruption of Mount Spurr could have significant impacts on air travel and local communities. The volcano’s previous eruptions in 1953 and 1992 produced ash clouds that disrupted aviation and deposited ash on Anchorage. If a similar eruption occurs, ash plumes could reach altitudes of over 50,000 feet, posing risks to aircraft engines and systems.
Local authorities are advising residents to prepare for potential ashfall by acquiring N95 masks and goggles to protect against respiratory and eye irritation. Pet owners are also taking precautions; for instance, Anchorage pet supply stores have reported increased sales of protective gear for animals.
Monitoring and Future Outlook
The AVO continues to monitor Mount Spurr closely, utilizing seismic networks, satellite imagery, and gas emission measurements. While the current level of unrest does not guarantee an eruption, scientists emphasize that any significant changes—such as increased seismic activity, gas emissions, or ground deformation—could indicate that an eruption is imminent.
Residents are encouraged to stay informed through official channels and to have emergency plans in place. Updates and detailed monitoring data are available on the AVO’s website.
