ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Wednesday, May 15, 2024, 12:00 PM AKDT (Wednesday, May 15, 2024, 20:00 UTC)
The slow eruption of lava in the summit crater of Great Sitkin Volcano continues. Minor seismic activity was observed over the past day with occasional small earthquakes detected. Satellite and webcam views of the active lava flow were obscured by clouds.
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.
Unrest at Shishaldin Volcano continues. Elevated seismicity continues with periods of low-level volcanic tremor and earthquake activity observed over the past day. Clear satellite imagery shows minor deposits extending up to ~2,500 feet (~750 meters) from the summit down the southwest drainage, likely associated with a minor collapse from the steep-walled summit crater region. Minor steaming was also observed in clear satellite views. No ash clouds were detected.
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
David Fee, Coordinating Scientist, UAF dfee1@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.