The Alaska Volcano Observatory lowered the Volcano Alert Level for Mount Spurr to Normal and the Aviation Color Code to Green at 10:07 AKDT (18:07 UTC) on August 20, 2025, following a gradual decline in unrest and the absence of ground deformation since March 2025.
Volcanic unrest continues at Mount Spurr, Alaska, with elevated seismic activity, surface deformation, persistent gas emissions, and visible summit steaming. The current unrest indicates that new magma has intruded into the Earth’s crust beneath the volcano and that the probability of an eruption has increased. The last known eruption at this volcano took place in 1992 (VEI 4).
The likelihood of an eruption at Mount Spurr has increased with gas emissions recorded on March 7 and 11, confirming ongoing volcanic unrest. The volcano is located about 120 km (75 miles) west of Anchorage (population 286 000), Alaska.
Mount Spurr in Alaska remains in a state of volcanic unrest, with AVO detecting numerous shallow earthquakes on February 13, 2025, likely caused by magma movement beneath the volcano. While an eruption is not expected in the near term, ongoing activity suggests one could occur in the future, most likely at Crater Peak, which erupted explosively in 1953 and 1992.
A gradual increase in volcanic unrest was observed at Spurr volcano in Alaska over the past couple of months, prompting the Alaska Volcano Observatory (AVO) to increase the Volcano Alert Level to Advisory and the Aviation Color Code to Yellow on October 16, 2024. Spurr is located about 120 km (75 miles) west of Anchorage.
Seismic activity at Mount Spurr volcano in Alaska remains elevated, with over 900 earthquakes detected so far in 2024, according to the Alaska Volcano Observatory (AVO). Despite the persistent unrest, no major shifts in earthquake frequency or intensity have been observed since the increase in seismic activity was first noted in April.
