Alaska Volcano Observatory Image Database

AVO IMAGE DATABASE

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Caption:	Euhedral plagioclase phenocryst from a Pleistocene lava collected on Shishaldin in 2018 in cross-polarized (XPL) and plain-polarized light (PPL). In cross polarized light distinctive crystal twinning is clearly visible, as well as a zoned rim due to changing extinction angles at different An contents.
Date:	October 13, 2021 12:00 AM
Photographer:	Loewen, Matt

Shishaldin

Caption:	Photomicrograph from a Davidof pumice deposited in a more than 15 m thick coarse pumice fall deposit. Phenocrysts of plagioclase and amphibole are visible in this cross polarized light image.
Date:	October 6, 2021 12:00 AM
Photographer:	Loewen, Matt

Davidof

Tephra

Caption:	Photomicrograph from a Davidof pumice deposited in a more than 15 m thick coarse pumice fall deposit. Phenocrysts of plagioclase and amphibole are visible in this plain polarized light image.
Date:	October 6, 2021 12:00 AM
Photographer:	Loewen, Matt

Davidof

Tephra

Caption:	WorldView-3 SWIR image of Great Sitkin on October 2, 2021.
Date:	October 2, 2021 10:56 PM
Photographer:	Loewen, Matt

Great Sitkin

Dome, Lava flow

Caption:	WorldView-3 SWIR image of Great Sitkin on October 2, 2021. Red-orange areas are high temperature lava, whiel blue is snow. Light blue is vegetation and browns to blacks are rock.
Date:	October 2, 2021 10:56 PM
Photographer:	Loewen, Matt

Great Sitkin

Dome, Lava flow

Caption:	WorldView-3 pansharpened near-IR image of Great Sitkin on October 2, 2021.
Date:	October 2, 2021 10:56 PM
Photographer:	Loewen, Matt

Great Sitkin

Dome, Lava flow

Caption:	Contact between a fine-grained gabbroic (plagioclase and pyroxene) inclusion (left) with host porphyritic lava (right) in a a May 25, 2021, Great Sitkin breadcrust bomb. At this location the center contact has distinctly coarser phenocrysts with little matrix material, while in other areas the fine-grained inclusion directly contacts the host.
Date:	October 1, 2021 12:00 AM
Photographer:	Loewen, Matt

Great Sitkin

Bomb

Caption:	Worldview-3 near-IR satellite image of Pavlof on September 28, 2021, showing recent ash deposits on the southeast flank and steaming from the north and currently active southeast craters (annotated with arrows).
Date:	September 28, 2021 9:53 PM
Photographer:	Loewen, Matt

Pavlof

Caldera/crater, Steam

Caption:	Thin section crossed-polarized light photomicrograph of a radial plagioclase phenocryst in a May 25, 2021, Great Sitkin breadcrust bomb. Smaller clinopyroxene and orthopyroxene phenocrysts are visible along with microlitic groundmass and glass.
Date:	September 24, 2021 12:00 AM
Photographer:	Loewen, Matt

Great Sitkin

Bomb

Caption:	Photograph of ashfall on the surface of a vehicle in the city of Kodiak after an ash resuspension event from the Katmai Region on September 21, 2021.
Date:	September 22, 2021 2:47 PM
Photographer:	Bodnar, Stephan

Array

Caption:	Small ash cloud produced by an explosion at Pavlof Volcano, as seen from Cold Bay, Alaska at 12:37 pm AKDT on September 21, 2021.
Date:	September 21, 2021 12:37 PM
Photographer:	Nielsen, Robert

Pavlof

Eruption cloud/ plume/ column

Caption:	GOES-17 satellite imagery showing resuspended ash (salmon pink cloud drifting southeast from the Alaska Peninsula over Kodiak Island and the Pacific Ocean) from the 1912 Novarupta-Katmai eruption. Satellite image acquired from the data service provided by the Cooperative Institute for Research in the Atmosphere at Colorado State University.
Date:	September 21, 2021 8:20 AM
Photographer:	Schneider, Dave

Array

Tephra

Caption:	Pavlof volcano with small ash emission, September 21, 2021, viewed from Cold Bay. Photo courtesy of Jennifer Merculief.
Date:	September 21, 2021 12:00 AM
Photographer:	Merculief, Jennifer

Pavlof

Eruption cloud/ plume/ column

Caption:	The lava dome at Great Sitkin continues to grow and is now spilling over the crater rim to the west and southwest. This multispectral short-wave infrared WorldView-3 image from 20 September 2021 shows the hottest areas in red, including the vent region and the crater overflows to the west and southwest (partially obscured by steam). The lava dome is black and snow cover is blue.
Date:	September 20, 2021 11:05 PM
Photographer:	Dietterich, Hannah

Great Sitkin

Dome, Lava flow

Caption:	Midday September 19 (00:47 9/20 UTC) TROPOMI SO2 product showing a robust gas plume traveling south-southeast from Semisopochnoi.
Date:	September 20, 2021 12:47 AM
Photographer:	Loewen, Matt

Semisopochnoi

Eruption cloud/ plume/ column

Caption:	Midday September 19 (00:43 9/20 UTC) VIIRS image with BTD (brightness temperature difference) ash signatures from Semisopochnoi matching 10,000-20,000 ft. wind trajectories.
Date:	September 20, 2021 12:43 AM
Photographer:	Loewen, Matt

Semisopochnoi

Eruption cloud/ plume/ column

Caption:	Midday September 19 (23:21 9/19 UTC) Sentinel-2 visible satellite image over Semisopochnoi showing an ash plume rising above the ~5000 ft. meteorological cloud deck.
Date:	September 19, 2021 11:21 PM
Photographer:	Loewen, Matt

Semisopochnoi

Eruption cloud/ plume/ column

Caption:	Midday September 19 (22:22 9/19 UTC) HIMARI (left) and GOES-17 (right) multispectral ash products showing 5 distinct ash puffs corresponding to the timing of 5 explosions recorded in seismic data (top).
Date:	September 19, 2021 10:00 PM
Photographer:	Loewen, Matt

Semisopochnoi

Eruption cloud/ plume/ column

Caption:	Ash cloud from North Cerberus crater extending above the clouds on Semisopochnoi Island, seen from CEPE webcam, September 19, 2021.
Date:	September 19, 2021 1:34 PM
Photographer:

Semisopochnoi

Eruption cloud/ plume/ column, Volcano

Caption:	Small ash cloud produced by an explosion at Pavlof Volcano, as seen from Cold Bay, Alaska at 3:13 pm AKDT on September 18, 2021.
Date:	September 18, 2021 3:13 PM
Photographer:	Nielsen, Robert

Pavlof

Eruption cloud/ plume/ column, Volcano

Caption:	Aerial view of one of the Tolsona Group mud volcanoes (muddy patch in upper half of image), located west of Glennallen, and north of the Glenn Highway.
Date:	September 16, 2021 6:13 PM
Photographer:	McGimsey, Game

Array

Gas, Hot Springs, Mud volcano

Caption:	Aerial view of one of the Tolsona Group mud volcanoes located west of Glennallen. The Tolsona mud volcanoes are located adjcent to, and up to about a kilometer north of the Glenn Highway.
Date:	September 16, 2021 6:13 PM
Photographer:	McGimsey, Game

Array

Gas, Hot Springs, Mud volcano

Caption:	Aerial view west of one of the Tolsona Group mud volcanoes located west of Glennallen. These mud vents are on the north side of Glenn Highway.
Date:	September 16, 2021 6:12 PM
Photographer:	McGimsey, Game

Array

Gas, Hot Springs, Mud volcano

Caption:	Tarsilo Girona (UAF/GI) acquires FLIR (Forward Looking Infrared Radiometer) imagery at one of the Tolsona Group mud volcanoes, located west of Glennallen.
Date:	September 16, 2021 6:10 PM
Photographer:	McGimsey, Game

Array

Fieldwork operations, Gas, Hot Springs, Mud volcano, People in action

Caption:	Tarsilo Girona (UAF/GI) acquires FLIR (Forward Looking Infrared Radiometer) imagery of one of the Tolsona Group mud volcanoes, located west of Glennallen. Temperatures indicated by the FLIR were near ambient.
Date:	September 16, 2021 6:10 PM
Photographer:	McGimsey, Game

Array

Gas, Hot Springs, Mud volcano, People in action

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