Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys. The Alaska Volcano Observatory is a cooperative program of the U.S. Pavel Izbekov, Acting Coordinating Scientist, UAFGI (907) 378-5460 Kristi Wallace, Acting Scientist-in-Charge, USGS (907) 786-7497 Most eruptions are relatively small, although the April-May 1999 event generated an ash column that reached 45,000 ft above sea level. 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. A 200-m-wide (660 ft) funnel-shaped summit crater typically emits a steam plume and occasional small amounts of ash. 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 16 km (10 mi). above sea level SSE Drifting ash cloud seen in satellite imagery, see current NWS SIGMET Hazard Analysis: SSE drifting ash cloud observed in satellite data, see current NWS SIGMET trace ashfall possible downwind of the volcano. AVO will continue to closely monitor unrest at Shishaldin Volcano. The local monitoring network is partially impaired, therefore AVO is also using nearby geophysical networks, satellite data and regional infrasound and lighting data to detect activity. These can occur with little warning. Shishaldin is monitored by local seismic and infrasound sensors, web cameras, and a telemetered geodetic network. Overnight webcam images confirmed glowing from the summit with only minor ash emission.Įruptions from Shishaldin have produced minor and on occasion significant ash clouds in the past. Most of the US West Coast remains in a tsunami advisory in the wake of an underground volcanic eruption near Tonga. Activity was detected on regional infrasound arrays, increasing seismic tremor, and elevated surface temperatures in satellite data. The National Weather Service has issued a SIGMET for this activity.Įruptive activity began increasing overnight starting around 1 am AKDT (09:00 UTC) with increased lava eruption from or within the summit crater but no significant ash emissions.
#RECENT VOLCANO ERUPTION IN ALASKA CODE#
The aviation Color Code remains at RED and the Volcano Alert Level at WARNING. The eruption is continuing and recent pilot observations estimated a 24,000 ft.
(7 km) above sea level from Shishaldin volcano began at 7:00 am AKDT (15:00 UTC) and is drifting SSE.
Location: N 54 deg 45 min W 163 deg 58 minĪn ash cloud with an initial height of around 30,000 ft. Issued: Tuesday, July 18, 2023, 8:37 AM AKDT
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