Alaska Volcano Observatory Image Database

AVO IMAGE DATABASE

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Caption:	Typical steam emissions from the north crater of Mount Young on Semisopochnoi volcano on the morning of March 27, 2023, from the CEPE webcam.
Date:	March 27, 2023 6:27 PM
Photographer:	Loewen, Matt

Semisopochnoi

Steam

Caption:	Sentinel-1 satellite radar interferogram spanning March 11–23, 2023, Aniakchak volcano. The bullseye pattern of color bands, or fringes, in the center of Aniakchak's caldera are indicative of surface uplift that is consistent with magma intrusion at around 4 km depth. Figure by Ronni Grapenthin, UAFGI/AVO.
Date:	March 23, 2023 12:00 AM
Photographer:	grapenthin, ronni

Aniakchak

Caldera/crater

Caption:	Sentinel-1 satellite radar interferogram spanning March 8–20, 2023, Tanaga Island. The color bands, or fringes, near the northwestern coast of the island show surface deformation suggestive of magma intrusion below Sajaka volcano and consistent with earthquake activity. Figure by Ronni Grapenthin, UAFGI/AVO.
Date:	March 20, 2023 12:00 AM
Photographer:	grapenthin, ronni

Tanaga

Volcano

Caption:	Overview of the seismic unrest in early March 2023 at Tanaga Island, which includes Takawangha and Tanaga volcanoes. The seismic data highlights the timing and amplitude of the largest earthquakes in the sequence. Thousands of earthquakes occurred during the time shown in the figure, but most were small and are not visible at the scale of the figure. Elevated earthquake activity under the volcanoes began in the fall of 2022 but increased dramatically on 8 March 2023. Earthquake locations during the swarm migrated from beneath Takawangha to beneath Tanaga and shallowed, increasing the likelihood that the activity could lead to an eruption and prompting AVO to increase the Aviation Color Code/Alert Level to ORANGE/WATCH. Earthquake rate and magnitude remained elevated through 12 March 2023 and then began to decline slowly. No signs of unrest were detected in other data streams. The decline in earthquake activity and lack of additional signs of unrest decreased the potential for an eruption so AVO lowered the Aviation Color Code/Alert Level to YELLOW/ADVISORY on 16 March.
Date:	March 16, 2023 10:00 AM
Photographer:	Lyons, John

Takawangha, Tanaga

Stratovolcano, Volcano

Caption:	Video showing six hours of seismic data from seismic station TANO on Tanaga Volcano. 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. Earthquakes are heard as "pops" and occur frequently during this time period. A lower frequency event is heard around 13:51 UTC (04:51 AK). Video created by David Fee and Liam Toney, UAFGI/AVO. To view video, click the "full res" link below to download the file.
Date:	March 10, 2023 2:00 PM
Photographer:	Fee, David

Tanaga

Seismic/GPS installation, Volcano

Caption:	Webicorder record for the past 24 hours from seismic station TASE, located 9.3 km (5.8 miles) southeast of Tanaga or 3.8 km (2.3 miles) south-southwest of Takawangha. Plot generated at 4:21 PM AKST on March 9, 2023.
Date:	March 9, 2023 12:00 AM
Photographer:	Orr, Tim

Takawangha, Tanaga

Stratovolcano, Volcano

Caption:	Hypocenter plot for Tanaga Volcano and Takawangha volcano showing earthquakes located over the past 2 weeks. Plot generated at 4:15 pm AKST on March 9, 2023.
Date:	March 9, 2023 12:00 AM
Photographer:	Orr, Tim

Takawangha, Tanaga

Stratovolcano, Volcano

Caption:	Figure showing recent earthquake activity under Tanaga Island.
Date:	March 9, 2023 12:00 AM
Photographer:	Kaufman, Max

Takawangha, Tanaga

Stratovolcano, Volcano

Caption:	Seismic data from AVO station TANO on March 8. Top) Waveform and Bottom) spectrogram of the vertical seismic data. The impulsive signals are local earthquakes while the longer duration, lower amplitude signal around 20:28 UTC is possible volcanic tremor. The signals originate near Tanaga volcano.
Date:	March 8, 2023 8:20 PM
Photographer:	Fee, David

Tanaga

Caption:	The active lava flow at the summit of Great Sitkin Volcano is viewed from the south. The lava has been filling the summit crater and sent lobes spilling down the southwest and western flanks in 2021 (partially snow covered). The active part of the lava flow (darker, less snow covered) is currently confined to the summit crater, advancing into a summit glacier to the east (right flow margin in this picture) and to the south (toward the camera), where it is nearing the crater rim.
Date:	March 8, 2023 12:00 AM
Photographer:	Fischer, Ed

Great Sitkin

Lava flow

Caption:	Aerial view of Douglas. Degassing from outer crater fumaroles can be seem in top right of image.
Date:	March 7, 2023 5:20 PM
Photographer:	Lopez, Taryn

Douglas

Fumarolic activity

Caption:	Aerial view of outer crater fumaroles on Douglas.
Date:	March 7, 2023 5:18 PM
Photographer:	Lopez, Taryn

Douglas

Fumarolic activity

Caption:	Aerial view of Augustine, Iliamna and Redoubt volcanoes from Douglas.
Date:	March 7, 2023 5:16 PM
Photographer:	Lopez, Taryn

Augustine, Douglas, Iliamna, Redoubt

Caption:	Aerial view of Douglas' summit crater. Ice can be seen rafting in a partially open lake surface and degassing from outer crater fumaroles can be seen in lower right of image.
Date:	March 7, 2023 5:07 PM
Photographer:	Lopez, Taryn

Array

Caption:	Aerial view of Fourpeaked with Douglas in background.
Date:	March 7, 2023 5:03 PM
Photographer:	Lopez, Taryn

Douglas, Fourpeaked

Caption:	Aerial view of crater of Southwest (New) Trident. Degassing from week fumaroles on the outer crater rim can be seen in top left of the image.
Date:	March 7, 2023 4:43 PM
Photographer:	Lopez, Taryn

Trident

Caption:	Aerial view of Katmai caldera (top left - sliver of lake visible), Trident (top right) and Novarupta (bottom right).
Date:	March 7, 2023 4:39 PM
Photographer:	Lopez, Taryn

Katmai, Novarupta, Trident

Caption:	Aerial view of Trident (center left), Novarupta (center bottom), Mageik (upper right) and Trident (upper far right) volcanoes.
Date:	March 7, 2023 4:39 PM
Photographer:	Lopez, Taryn

Mageik, Martin, Novarupta, Trident

Caption:	Aerial view of Novarupta.
Date:	March 7, 2023 4:38 PM
Photographer:	Lopez, Taryn

Novarupta

Caption:	Aerial view of Katmai's caldera lake - completely snow free. Discoloration from sediment/fluid upwelling can be seen in center of the lake.
Date:	March 7, 2023 4:36 PM
Photographer:	Lopez, Taryn

Array

Caption:	Aerial view of a snow-free Katmai caldera lake.
Date:	March 7, 2023 4:35 PM
Photographer:	Lopez, Taryn

Katmai

Caption:	Aerial view of Trident volcano with persistent degassing features on the crater rim of Southwest (New) Trident and the southeast flank of Trident I circled in red.
Date:	March 7, 2023 4:33 PM
Photographer:	Lopez, Taryn

Trident

Gas

Caption:	Aerial view of Trident volcano from the southwest.
Date:	March 7, 2023 4:32 PM
Photographer:	Lopez, Taryn

Trident

Caption:	Aerial view of Trident volcano from the northeast, with Mageik seen in the background.
Date:	March 7, 2023 4:30 PM
Photographer:	Lopez, Taryn

Mageik, Trident

Caption:	Aerial view of Trident volcano as viewed from the south. The southeast fumarole field on Trident I is visible in lower center of the image. The Valley of Ten Thousand Smokes can be seen in the background.
Date:	March 7, 2023 4:29 PM
Photographer:	Lopez, Taryn

Trident

Gas

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