Alaska Volcano Observatory

Lava continues to erupt at a slow rate in the summit crater of Great Sitkin volcano. Comparison of recent satellite radar images shows continued slow eruption and advance of the lava flow lobe near the vent region. Intermittent small volcanic earthquakes continue at a low rate.  
  
Since the May 2021 explosion, there have been no other explosions at Great Sitkin Volcano. The lava eruption that began in July 2021 is ongoing. It has filled most of the summit crater and advanced into valleys below. The Alaska Volcano Observatory (AVO) monitors Great Sitkin using seismic, infrasound, and satellite data.

 

Unrest continues at Mount Spurr. Small, shallow earthquakes beneath the summit continue at low rate, but with a slight increase over last week. Intermittent minor steaming from the summit was observed in web camera images during periods of clear viewing conditions. The most recent high-resolution satellite image, captured November 11, 2024, showed no significant changes at the summit crater and the lake there is mostly covered by snow and ice.  
  
AVO is closely monitoring Mount Spurr for signs of increased unrest using local seismic, infrasound, web camera, and GNSS stations, along with regional infrasound and lightning networks and satellite data. We would expect changes in the earthquakes, ground deformation, summit lake, and fumaroles if magma began to move closer to the surface. Thus, if an eruption were to occur, it would be preceded by additional signals that would allow advance warning.