Aleutians

(52.0765, -176.1109)
2024-06-21 19:38:32 UTC

The eruption of lava within the summit crater of Great Sitkin Volcano continues, as observed by satellite radar images through June 15. Seismic activity was low, with occasional small volcanic earthquakes. This level of seismicity is typical of the current eruption. Slightly elevated surface temperatures were seen intermittently in satellite images when there was little cloud cover. 

The current, prolonged period of lava eruption at Great Sitkin Volcano began in July 2021 and has mainly been observed using satellite radar images that can view the volcano through the frequent cloud cover. A single explosive event occurred in May 2021, and no other explosions have been detected since that time.

5709 ft (1740m) elevation
Instrumented

Aleutians

(54.7554, -163.9711)
2024-06-21 19:38:32 UTC

Low-level unrest continues at Shishaldin Volcano, with occasional small volcanic earthquakes and weak seismic tremor observed throughout the week. Very weak explosive activity was detected in local infrasound data during a period of optimal environmental conditions. Steam and sulfur dioxide gas emissions were observed in satellite data on several days over the past week. These observations are typical of Shishaldin during this post-eruption period of unrest. 

Minor rock falls associated with collapse events from the unstable ground in and near the summit crater may generate small clouds of fine-grained dust that dissipate quickly near the summit. No significant eruptive activity has occurred since November 2023. 

Local seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lighting data, and satellite images to monitor the volcano. 

9373 ft (2857m) elevation
Instrumented



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.