A giant volcano in Alaska is showing signs of an impending eruption. Significantly elevated levels of volcanic gas emissions were recently observed around Mount Spurr, which is located 75 miles from Anchorage that is home to nearly 300,000 people. The Alaska Volcano Observatory (AVO) said the emissions ‘confirm’ that new magma is flowing beneath the volcano, indicating an foreseeable eruption.

Increased seismic activity and ground deformation have also been detected in the surrounding area. These signs indicate ‘that an eruption is likely, but not certain, to occur within the next few weeks or months,’ scientists said. If Mount Spurr erupts, it would produce destructive mudslides, avalanches of hot gas and flows of lava racing down the volcano’s side at over 200 miles per hour.

Scientists predict the ash cloud would travel hundreds of miles away, engulfing anyone in low-lying areas in toxic emissions. ‘While we expect additional changes to monitoring data prior to an eruption, it is also possible that an eruption could occur with little or no additional warning,’ they said. The warning comes after Mount Spurr experienced a cluster of small earthquakes in recent months.

‘Over the last month, AVO has located over 100 earthquakes per week under Mount Spurr,’ the team shared in a Wednesday bulletin. ‘Most earthquakes are shallow (less than 2.5 miles below sea level). Magnitudes during this time are as large as M2.7. Over 3400 earthquakes have been located under the volcano since April 2024.’

The most recent signs were the increase of gas emissions, which reflect shifts in magma properties and activity beneath the volcano. The observatory conducted two flights above the volcano, capturing high levels of sulfur dioxide, carbon dioxide and other gases.