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| Image | Details | Volcanoes | Keywords |
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| Caption: | Video of 21 June 2019 Iliamna Volcano ice and rock avalanche seismic signal intended for outreach. Public-facing caption:
"Ever wonder how the Earth "hears" a large mass movement? AVO recorded seismic signals from an approximately 5-mile-long ice and rock avalanche on Iliamna Volcano in June 2019. The ground motion data in this movie are sped up by a factor of 200, turning the normally sub-audible rumbling into a soundtrack humans can hear. The bottom panel shows ground velocity over time, and the top panel shows the corresponding frequency content (i.e., the "pitch" of the sound)." |
| Date: | February 18, 2020 12:00 AM |
| Photographer: | Toney, Liam |
| Iliamna | Avalanche |
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| Caption: | Backscatter Electron Image (BSE) mosaic of tephra erupted from Shishaldin Volcano on January 19, 2020. Sample collected in False Pass, AK by Melanie Hoblet. The image is 8.6 mm accross showing a cross section of grains separated from the 125-250 µm size fraction. 75% of grains are glassy (medium gray) with sparse microlites and phenocrysts of plagioclase (dark gray), olivine (light gray), and Fe-Ti oxides (white). Image taken with a JEOL 6510LV Scanning Electron Microscope. |
| Date: | February 7, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | |
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| Caption: | Backscatter Electron Image (BSE) of tephra erupted from Shishaldin Volcano on January 19, 2020. Sample collected in False Pass, AK by Melanie Hoblet. The left grain in almost entirely crystallized while the left grain has rounded vesicles (bubbles), sparse plagioclase microlites (dark gray angular shapes), and a clean glass matrix. The right grains make up roughly 75% of the overall sample. Image taken with a JEOL 6510LV Scanning Electron Microscope. |
| Date: | February 7, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
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| Caption: | Backscatter Electron Image (BSE) of tephra erupted from Shishaldin Volcano on January 19, 2020. Sample collected in False Pass, AK by Melanie Hoblet. Image taken with a JEOL 6510LV Scanning Electron Microscope. |
| Date: | February 7, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
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| Caption: | Backscatter Electron Image (BSE) of tephra erupted from Shishaldin Volcano on January 19, 2020. Sample collected in False Pass, AK by Melanie Hoblet. The light gray crystals in the upper middle part of image are olivine, and small dark gray crystals are plagioclase. Image taken with a JEOL 6510LV Scanning Electron Microscope. |
| Date: | February 7, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | |
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| Caption: | Scanning electron microscope (SEM) image of tephra morphology from material erupted from Shishaldin Volcano on January 19, 2020. Sample collected in False Pass, AK by Melanie Hoblet. Image taken with a JEOL 6510LV SEM in low vacuum mode.
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| Date: | February 5, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
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| Caption: | Scanning electron microscope (SEM) image of tephra morphology from material erupted from Shishaldin Volcano on January 19, 2020. Sample collected in False Pass, AK by Melanie Hoblet . Image taken with a JEOL 6510LV SEM in low vacuum mode.
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| Date: | February 5, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
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| Caption: | Scanning electron microscope (SEM) image of tephra morphology from material erupted from Shishaldin on January 7, 2020, and collected by the Department of Transportation in Cold Bay. Image taken with a JEOL 6510LV SEM in low vacuum mode.
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| Date: | February 5, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
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| Caption: | Scanning electron microscope (SEM) image of tephra morphology from material erupted from Shishaldin on December 12, 2019 and collected by AVO field crews on the southeast flank on December 20. Image taken with a JEOL 6510LV SEM in low vacuum mode. |
| Date: | February 5, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
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| Caption: | Scanning electron microscope (SEM) image of tephra morphology from material erupted from Shishaldin on January 7, 2020, and collected by the Department of Transportation in Cold Bay. Image taken with a JEOL 6510LV SEM in low vacuum mode. |
| Date: | February 5, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
 |
| Caption: | Scanning electron microscope (SEM) image of tephra morphology from material erupted from Shishaldin Volcano on January 19, 2020. Sample collected in False Pass, AK by Melanie Hoblet . Image taken with a JEOL 6510LV SEM in low vacuum mode.
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| Date: | February 5, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
 |
| Caption: | Scanning electron microscope (SEM) image of tephra morphology from material erupted from Shishaldin on December 12, 2019 and collected by AVO field crews on the southeast flank on December 20. Image taken with a JEOL 6510LV SEM in low vacuum mode. |
| Date: | February 5, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
 |
| Caption: | Scanning electron microscope (SEM) image of tephra morphology from material erupted from Shishaldin on January 7, 2020, and collected by the Department of Transportation in Cold Bay. Image taken with a JEOL 6510LV SEM in low vacuum mode. |
| Date: | February 5, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
 |
| Caption: | Scanning electron microscope (SEM) image of tephra morphology from material erupted from Shishaldin on December 12, 2019 and collected by AVO field crews on the southeast flank on December 20. Image taken with a JEOL 6510LV SEM in low vacuum mode. |
| Date: | February 5, 2020 12:00 AM |
| Photographer: | Loewen, Matt |
| Shishaldin | Tephra |
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| Caption: | Near-infrared Worldview-3 satellite image of the Pavlof summit. Steam emissions fill the crater north of the summit (in the shade), which is typical activity at Pavlof. |
| Date: | January 23, 2020 9:59 PM |
| Photographer: | Loewen, Matt |
| Pavlof | |
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| Caption: | Landsat 8 TIR (Band 11) image of Shishaldin Volcano and Unimak Island. Image acquired January 23, 2020. Hot lava flows and pyroclastic deposits evident at summit of volcano. Blue dashed line shows meltwater pathway north of the volcano. |
| Date: | January 23, 2020 12:00 AM |
| Photographer: | waythomas, chris |
| Shishaldin | Debris flow/mudflow/landslide/lahar, Lava flow |
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| Caption: | Video of infrasound data (top) and spectrogram data (bottom), from the eruption of Shishaldin Volcano on 19-20 January 2020. The soundtrack was derived from the infrasound datastream by mapping the normally subaudible infrasound signal into the range of human hearing. In this track, you can hear numerous short-duration explosions spaced closely in time until 1/20 0000 UTC, when the eruption transitions to sustained jetting. The jetting coincides with increased ash emissions, and the eruption abruptly ends around 05:45 UTC. Data were recorded at AVO station SSLN. Video created by David Fee, UAFGI/AVO. |
| Date: | January 23, 2020 12:00 AM |
| Photographer: | Fee, David |
| Shishaldin | Infrasound |
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| Caption: | A beautiful winter day at Makushin hot springs. Photo courtesy of Travis Swangel. |
| Date: | January 22, 2020 3:38 PM |
| Photographer: | Swangel, Travis |
| Makushin | Hot Springs |
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| Caption: | Station MREP, Makushin volcano. Photo courtesy of Travis Swangel. |
| Date: | January 22, 2020 1:47 PM |
| Photographer: | Swangel, Travis |
| Makushin | Fieldwork operations |
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| Caption: | Station MREP, Makushin volcano. Photo courtesy of Travis Swangel. |
| Date: | January 22, 2020 1:46 PM |
| Photographer: | Swangel, Travis |
| Makushin | Fieldwork operations |
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| Caption: | BSE image of tephra sample erupted from Shishaldin on January 7, 2020 and collected by the Department of Transportation in Cold Bay. Dark gray crystals are plagioclase and light gray are olivine. This imaged grain has a clean glassy matrix with rounded vesicles (gas bubbles). Image taken with a JEOL 6510LV Scanning Electron Microscope. |
| Date: | January 22, 2020 12:00 AM |
| Photographer: | , Fiona Eberhardt |
| Shishaldin | Tephra |
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| Caption: | BSE image of tephra grain erupted from Shishaldin January 7, 2020, collected by the Department of Transportation in Cold Bay. Dark gray elongated crystals are plagioclase and light gray are olivine. This imaged grain has clean glassy matrix mixed and shows dendritic overgrowth of microlites. Image taken with a JEOL 6510LV Scanning Electron Microscope. |
| Date: | January 22, 2020 12:00 AM |
| Photographer: | eberhardt, fiona |
| Shishaldin | Tephra |
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| Caption: | Overview BSE image of tephra sample erupted from Shishaldin January 7, 2020, collected by the Department of Transportation in Cold Bay. Image taken with a JEOL 6510LV Scanning Electron Microscope. |
| Date: | January 22, 2020 12:00 AM |
| Photographer: | , Fiona Eberhardt |
| Shishaldin | Tephra |
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| Caption: | BSE image of tephra grain erupted from Shishaldin January 7, 2020, collected by the Department of Transportation in Cold Bay. The largest grain contains dark gray crystals (plagioclase), light gray (olivine), and white are Fe-Ti oxides. This grain has a completely devitrified (crystallized) groundmass. Additional grains consist of clean glass groundmass with plagioclase and Fe-Ti oxides. Image taken with a JEOL 6510LV Scanning Electron Microscope. |
| Date: | January 22, 2020 12:00 AM |
| Photographer: | eberhardt, fiona |
| Shishaldin | Tephra |
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| Caption: | Pyroclastic deposits, cooling lava flows, and a steam plume visible in a multispectral SWIR Sentinel-2 image from Shishaldin one day after an explosive episode. |
| Date: | January 20, 2020 10:18 PM |
| Photographer: | Dietterich, Hannah |
| Shishaldin | |
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