USGS Monitors Ongoing Activity at Alaskan Volcanoes
• The Alaska Volcano Observatory (AVO) has reported ongoing volcanic activity at several sites, including Great Sitkin, Gareloi, and Shishaldin volcanoes. At Great Sitkin, lava continues to erupt slowly within the summit crater, with minor earthquakes and steaming observed. This eruption has been ongoing since July
• Gareloi volcano, meanwhile, persistently emits magmatic gases and exhibits low-level seismic activity, suggesting shallow magma presence. A short-duration explosion on October 1 may indicate changes in the magmatic-hydrothermal system, though the likelihood of a larger eruption remains unclear. Shishaldin volcano has shown slightly elevated seismic and infrasound activity, along with minor sulfur dioxide emissions. Monitoring efforts include seismic sensors, satellite data, webcams, and infrasound networks.
Impact & Risks
The ongoing volcanic activity poses potential risks to nearby communities, air traffic, and the environment. Lava flows at Great Sitkin have already filled much of the summit crater and extended into nearby valleys. Gareloi's magmatic gas emissions and seismic activity could signal further changes in its magma system, while Shishaldin's sulfur dioxide emissions may impact air quality. Although no immediate eruptions are expected, the situation requires close monitoring to mitigate risks to residents and aviation in the region.
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