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USGS Volcano Notice - DOI-USGS-AVO-2024-07-09T19:03:25+00:00


U.S. Geological Survey
Tuesday, July 9, 2024, 11:20 AM AKDT (Tuesday, July 9, 2024, 19:20 UTC)

52°4'35" N 176°6'39" W, Summit Elevation 5709 ft (1740 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

No significant changes seen at Great Sitkin Volcano where lava continues to slowly erupt within the summit crater. Over the past day, a few earthquakes were detected beneath the volcano. Satellite and web camera views of the active lava flow have mostly been obscured by clouds.

The current lava flow eruption began 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.

54°45'19" N 163°58'16" W, Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

No major changes were detected in the past day at Shishaldin Volcano, where minor volcanic unrest continues. Small, low-frequency earthquakes and seismic tremor were occurring. Minor infrasound signals were also detected during periods of low wind, possibly coming from bubbles bursting deep inside the volcanic crater. A steam and sulfur dioxide plume from the summit was observed in web camera and satellite images. 

Minor rock falls associated with gravitational collapse of the unstable ground in and near the summit crater may occur without warning. The collapse events can generate small clouds of dust likely composed of fine-grained ash. The diffuse dust clouds dissipate quickly and can produce irregular-shaped deposits near the summit. The last significant ash-producing eruption occurred in 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. 


Matt Haney, Scientist-in-Charge, USGS, mhaney@usgs.gov, (907) 786-7497

Tarsilo Girona, Acting Coordinating Scientist, UAFGI, tarsilo.girona@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.