ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Sunday, February 11, 2024, 1:37 PM AKST (Sunday, February 11, 2024, 22:37 UTC)
Ash emissions were observed in one clear web camera image from 18:25 UTC (9:25 AKST), February 11, 2024. The ash in the web camera image extends from the summit crater and drapes down over the volcano's north flank. This ash emission episode corresponds with seismic signals typically associated with surficial mass flows. The low-level ash cloud may have resulted from a non-eruptive collapse of previously emplaced ash and pyroclastic debris on the upper part of the Shishaldin cone.
Clouds have obscured summit views in web camera images after the 18:25 UTC image. No ash clouds have been observed in satellite imagery. Thus, the Aviation Color Code and the Volcano Alert Level was raised to ORANGE/WATCH this afternoon.
No significant eruptive activity has been observed 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 detect eruptions.
Slow eruption of lava in the summit crater of Great Sitkin Volcano likely continues. A few low-frequency earthquakes ocurred over the past day. Clouds have obscured satellite and web camera images.
The current lava flow began erupting in July 2021. No explosive events have occurred since a single event in May 2021.
Local seismic and infrasound sensors and web cameras are used to monitor Great Sitkin along with regional infrasound and lightning networks and satellite data.
Several earthquakes and a brief period of seismic tremor occurred at Kanaga Volcano over the past day. Clouds have obscured satellite and web camera views of the volcano.
A steam-driven explosion occurred at Kanaga on December 18, 2023 and since then, seismic activity at the volcano has been above background. This unrest may mean that the likelihood of explosive ash-producing activity has increased.
Local seismic and infrasound sensors and web cameras are used to monitor Kanaga. AVO also uses regional infrasound and lightning networks as well as satellite data.
Matt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497
Ronni Grapenthin, Acting Coordinating Scientist, UAFGI, rgrapenthin@alaska.edu (907) 378-5460
The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.