The Alaska Volcano Observatory (AVO) is a consortium of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the State of Alaska Division of Geological & Geophysical Surveys.

The volcanoes in Alaska make up more than three-quarters of U.S. volcanoes that have erupted in the past 200 years. Most of Alaska’s volcanoes are located along the 2,500 km (1,500 mi) Aleutian Arc, which extends westward from the mainland of Alaska towards Kamchatka, and forms the northern portion of the Pacific “ring of fire.”

[12] 2016 Volcanic activity in Alaska - Summary of events and response of the Alaska Volcano Observatory, 2020

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137 and G23AC00070. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.

A map of Mount Spurr, Alaska, showing monitoring stations operated by the Alaska Volcano Observatory and hypocenters of earthquakes that occurred from January 1, 2024 through February 6, 2025. Mount Spurr is about 75 miles (120 km) west of Anchorage.

6 days ago · The current eruption of Great Sitkin Volcano began with a single explosive event in May 2021. The ongoing eruption of lava at the summit began shortly afterward, in July 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data and web cameras, and regional infrasound and lightning networks.

Analysis of seismic data indicates a subtle increase in the rate and size of earthquakes over the past few weeks. Because this is a notable departure from the normal background seismicity of the volcano, AVO is raising the Aviation Color Code to YELLOW and the …

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Abbey Nastan is a geologist with the Alaska Volcano Observatory. Her work focuses on stewardship of AVO volcanic data, volcano research, and science communication. Prior to working for AVO, she worked at the NASA Jet Propulsion Laboratory.

Feb 4, 2025 · The current eruption of Great Sitkin Volcano began with a single explosive event in May 2021. The ongoing eruption of lava at the summit began shortly afterward, in July 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data and web cameras, and regional infrasound and lightning networks.