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USGS Volcano Notice - DOI-USGS-AVO-2024-02-16T21:16:48+00:00
Volcano: Shishaldin (VNUM #311360)
Current Volcano Alert Level: ADVISORY
Previous Volcano Alert Level: WATCH
Current Aviation Color Code: YELLOW
Previous Aviation Color Code: ORANGE
Issued: Saturday, February 17, 2024, 11:26 AM AKST
Source: Alaska Volcano Observatory
Notice Number: 2024/A176
Location: N 54 deg 45 min W 163 deg 58 min
Elevation: 9373 ft (2857 m)
Area: Aleutians
Volcanic Activity Summary:
Shishaldin Volcano is not showing any signs of ongoing ash emissions or eruptive activity. Seismicity remains elevated with ongoing volcanic earthquakes, but there is no indication of explosive activity or the presence of lava in the crater. The current activity is consistent with continued volcanic unrest but not an active eruption, and AVO is lowering the Aviation Color Code to YELLOW and Volcano Alert Level to ADVISORY.
The last significant eruptive activity was in November 2023.
Shishaldin Volcano is monitored by local seismic and infrasound sensors, web cameras, and a telemetered geodetic network. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lighting data, and satellite images to monitor the volcano.
Recent Observations:
[Volcanic cloud height] Unknown
[Other volcanic cloud information] Unknown
Hazard Analysis:
[Ashfall] Proximal flanks of the volcano
Remarks:
Shishaldin Volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a spectacular symmetric cone with a base diameter of approximately 10 miles (16 km). A 660 ft. (200 m) wide funnel-shaped summit crater typically emits a steam plume and occasional small amounts of ash. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including over 26 confirmed eruptions since 1824. Most eruptions are relatively small, although the April-May 1999 event generated an ash column that reached 45,000 ft. (14 km) above sea level.
Contacts:
Matt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497
Pavel Izbekov, Acting Coordinating Scientist, UAFGI peizbekov@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.
| (1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) | |
| (2) Issued: | (20240217/2026Z) |
| (3) Volcano: | Shishaldin (VNUM #311360) |
| (4) Current Color Code: | YELLOW |
| (5) Previous Color Code: | ORANGE |
| (6) Source: | Alaska Volcano Observatory |
| (7) Notice Number: | 2024/A176 |
| (8) Volcano Location: | N 54 deg 45 min W 163 deg 58 min |
| (9) Area: | Aleutians |
| (10) Summit Elevation: | 9373 ft (2857 m) |
| (11) Volcanic Activity Summary: |
Shishaldin Volcano is not showing any signs of ongoing ash emissions or eruptive activity. Seismicity remains elevated with ongoing volcanic earthquakes, but there is no indication of explosive activity or the presence of lava in the crater. The current activity is consistent with continued volcanic unrest but not an active eruption, and AVO is lowering the Aviation Color Code to YELLOW and Volcano Alert Level to ADVISORY. The last significant eruptive activity was in November 2023. Shishaldin Volcano is monitored by local seismic and infrasound sensors, web cameras, and a telemetered geodetic network. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lighting data, and satellite images to monitor the volcano. |
| (12) Volcanic cloud height: | Unknown |
| (13) Other volcanic cloud information: | Unknown |
| (14) Remarks: | Shishaldin Volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a spectacular symmetric cone with a base diameter of approximately 10 miles (16 km). A 660 ft. (200 m) wide funnel-shaped summit crater typically emits a steam plume and occasional small amounts of ash. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including over 26 confirmed eruptions since 1824. Most eruptions are relatively small, although the April-May 1999 event generated an ash column that reached 45,000 ft. (14 km) above sea level. |
| (15) Contacts: | Matt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497 Pavel Izbekov, Acting Coordinating Scientist, UAFGI peizbekov@alaska.edu (907) 378-5460 |
| (16) Next Notice: | |