Bogoslof unrest 2023
Start: October 24, 2023 [1]
Stop: November 24, 2023 [1]
Event Type: Not an eruption
- Seismicity with no confirmed eruption [1]
Description: On October 24, 2023, AVO raised the Aviation Color Code and Volcano Alert Level for Bogoslof to YELLOW/ADVISORY, stating:
"Over the past three days, over 90 earthquakes have been detected in the vicinity of Bogoslof volcano. This marks a change in behavior and the Aviation Color Code and Volcano Alert Level is being increased to YELLOW/ADVISORY. Increases in seismic activity typically precede eruptions, but many volcanoes have exhibited similar behavior that did not result in eruptions. There have been no other signs of unrest observed in satellite data over the past several days."
Seismicity levels at Bogoslof gradually declined over the next month, and no other signs of unrest were observed. On November 24, 2024, AVO returned the alert levels to UNASSIGNED, stating that activity had returned to background levels.
"Over the past three days, over 90 earthquakes have been detected in the vicinity of Bogoslof volcano. This marks a change in behavior and the Aviation Color Code and Volcano Alert Level is being increased to YELLOW/ADVISORY. Increases in seismic activity typically precede eruptions, but many volcanoes have exhibited similar behavior that did not result in eruptions. There have been no other signs of unrest observed in satellite data over the past several days."
Seismicity levels at Bogoslof gradually declined over the next month, and no other signs of unrest were observed. On November 24, 2024, AVO returned the alert levels to UNASSIGNED, stating that activity had returned to background levels.
References Cited
[1] Alaska Volcano Observatory website, 2005
Alaska Volcano Observatory, 2005-, Alaska Volcano Observatory website: http://www.avo.alaska.edu.Complete Eruption References
Alaska Earthquake Center Quarterly Technical Report, October-December 2023, 2024
Ruppert, N.A., Farrell, A., Grassi, B., Holtkamp, S.G., Low, G., McFarlin, H., Nadin, E., Parcheta, C., West, M.E., and Wiser, S., 2024, Alaska Earthquake Center Quarterly Technical Report, October-December 2023: Alaska Earthquake Center Quaterly Technical Report 2023-Q4,49 p.
Full-text PDF 18 MB Alaska Volcano Observatory website, 2005
Alaska Volcano Observatory, 2005-, Alaska Volcano Observatory website: http://www.avo.alaska.edu.