The eruption of lava at Great Sitkin in the Aleutians has now reached an impressive fourth birthday! The lava flow started sometime in late July 2021. Enjoy this compilation of radar satellite data, which shows the growth of the flow and dome since then. #Alaska #volcano USGS Volcanoes UAF Geophysical Institute Alaska DGGS Alt text: This video shows a series of stills of somewhat grainy, black-and-white views of Great Sitkin from a top-down view. There is an approximately oval feature in the cen
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The eruption of lava at Great Sitkin in the Aleutians has now reached an impressive fourth birthday! The lava flow started sometime in late July 2021. Enjoy this compilation of radar satellite data, which shows the growth of the flow and dome since then. #Alaska #volcano USGS Volcanoes UAF Geophysical Institute Alaska DGGS Alt text: This video shows a series of stills of somewhat grainy, black-and-white views of Great Sitkin from a top-down view. There is an approximately oval feature in the cen
160.5K views10 months ago
FacebookAlaska Volcano Observatory
3 years of lava effusion at #GreatSitkin! After a brief explosive eruption on May 25, 2021, lava began oozing out of a vent in the summit crater in July 2021. The first sign of new lava at the surface was a July 23, 2021 satellite radar Terra-SAR-X image. These radar images can see through the persistent clouds of the Aleutian Islands and show an incredible time series animation of the lava flow growth. The most recent lava flows have oozed out above the vent and overtopped early emplaced lavas.
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3 years of lava effusion at #GreatSitkin! After a brief explosive eruption on May 25, 2021, lava began oozing out of a vent in the summit crater in July 2021. The first sign of new lava at the surface was a July 23, 2021 satellite radar Terra-SAR-X image. These radar images can see through the persistent clouds of the Aleutian Islands and show an incredible time series animation of the lava flow growth. The most recent lava flows have oozed out above the vent and overtopped early emplaced lavas.
18.5K viewsJul 22, 2024
FacebookAlaska Volcano Observatory
Eruption of Mount Cerberus on Semisopochnoi Island from the Alaska Volcano Observatory's webcam on Sept 7, 2021. That will get you an orange alert. https://avo.alaska.edu/webcam/semi_cepe.php# | Must Read Alaska
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Eruption of Mount Cerberus on Semisopochnoi Island from the Alaska Volcano Observatory's webcam on Sept 7, 2021. That will get you an orange alert. https://avo.alaska.edu/webcam/semi_cepe.php# | Must Read Alaska
6.9K viewsSep 8, 2021
FacebookMust Read Alaska
Great Sitkin Volcano (🌋ORANGE/WATCH) has been erupting since 2021! Watch the 2025 growth of the lava dome inside the summit crater in this animation built from radar satellite imagery. About 8 million cubic meters (~3200 Olympic pools) of lava erupted in 2025. #Alaska #alaska #volcano Caption: Animation of the lava dome growth throughout 2025 at Great Sitkin Volcano as observed in satellite radar imagery from the TerraSAR-X and TanDEM-X satellites. Lava started the year flowing northeast from t
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Great Sitkin Volcano (🌋ORANGE/WATCH) has been erupting since 2021! Watch the 2025 growth of the lava dome inside the summit crater in this animation built from radar satellite imagery. About 8 million cubic meters (~3200 Olympic pools) of lava erupted in 2025. #Alaska #alaska #volcano Caption: Animation of the lava dome growth throughout 2025 at Great Sitkin Volcano as observed in satellite radar imagery from the TerraSAR-X and TanDEM-X satellites. Lava started the year flowing northeast from t
23.8K views4 months ago
FacebookAlaska Volcano Observatory
Video showing six hours of seismic data leading up to the May 25, 2021 Great Sitkin eruption. The number of earthquakes steadily increases leading up to the eruption at 05:04 UTC (09:04 AKDT), when the earthquakes cease. The top panel shows the spectrogram, and below is the seismic data. The audio is the subaudible seismic signal mapped to the range of human hearing. Video created by David Fee and Liam Toney, UAFGI/AVO | Alaska Volcano Observatory
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Video showing six hours of seismic data leading up to the May 25, 2021 Great Sitkin eruption. The number of earthquakes steadily increases leading up to the eruption at 05:04 UTC (09:04 AKDT), when the earthquakes cease. The top panel shows the spectrogram, and below is the seismic data. The audio is the subaudible seismic signal mapped to the range of human hearing. Video created by David Fee and Liam Toney, UAFGI/AVO | Alaska Volcano Observatory
1K viewsMay 26, 2021
FacebookAlaska Volcano Observatory
🚨ALASKA RING OF FIRE: VOLCANO ALERTS AND EARTHQUAKES TOGETHER In the last 48 hours, the Alaska Volcano Observatory has kept Great Sitkin Volcano at WATCH / ORANGE, confirming that lava is still actively erupting inside the summit crater. This eruption has been going on since 2021, slowly filling the crater with new lava. Small local earthquakes continue to be recorded near the volcano, a sign that magma is still moving and the system is not done yet. Shishaldin Volcano is currently at ADVISORY
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🚨ALASKA RING OF FIRE: VOLCANO ALERTS AND EARTHQUAKES TOGETHER In the last 48 hours, the Alaska Volcano Observatory has kept Great Sitkin Volcano at WATCH / ORANGE, confirming that lava is still actively erupting inside the summit crater. This eruption has been going on since 2021, slowly filling the crater with new lava. Small local earthquakes continue to be recorded near the volcano, a sign that magma is still moving and the system is not done yet. Shishaldin Volcano is currently at ADVISORY
225.4K views3 months ago
FacebookDivya Krishnamoorthy
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🚨Alaska’s Ring of Fire is active The Alaska Volcano Observatory currently has three volcanoes on alert at the same time, all sitting on the Aleutian arc. First, Great Sitkin Volcano. Lava has been slowly erupting inside its summit crater since 2021, filling most of the crater with a thick flow. As of January 17, 2026, AVO lists Great Sitkin at WATCH with an ORANGE aviation color code. That means the eruption is still ongoing and ash is possible if activity changes, even though seismicity is low
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