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Caption:On February 19 AVO geologists, Janet Schaefer AVO/ADGGS and Kristi Wallace AVO/USGS, conducted helicopter-supported field investigations of the ash that fell on Unalaska Island during the January 30-31 Bogoslof eruption. Wind and exposure to sunlight since the ash fall event has caused the ash to be encased in ice and the exposed ash now appears as gray areas on the hillside. Samples were collected at nine locations across the island. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm)
Date:February 19, 2017 3:35 PM
Photographer:Schaefer, Janet
BogoslofEruption cloud/ plume/ column, Fieldwork operations, Tephra
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Caption:Photo showing the Bogoslof ashfall deposit from 31 January 2017 as seen on 19 February during a sampling expedition on the west side of Unalaska Island. Wind and exposure to sunlight since the ashfall event has caused the ash to be encased in recrystallized firn snow. Samples were collected at nine locations across the island. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm).
Date:February 19, 2017 3:17 PM
Photographer:Wallace, Kristi
BogoslofFieldwork operations
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Caption:On February 19 AVO geologists, Janet Schaefer AVO/ADGGS and Kristi Wallace AVO/USGS, conducted helicopter-supported field investigations of the ash that fell on Unalaska Island during the January 30-31 Bogoslof eruption. Wind and exposure to sunlight since the ash fall event has caused the ash to be encased in ice and the exposed ash now appears as gray areas on the hillside. Samples were collected at nine locations across the island. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm)
Date:February 19, 2017 3:10 PM
Photographer:Schaefer, Janet
BogoslofEruption cloud/ plume/ column, Fieldwork operations, Tephra
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Caption:Photo showing the Bogoslof ashfall deposit from 31 January 2017 as seen on 19 February during a sampling expedition on the west side of Unalaska Island. Wind and exposure to sunlight since the ashfall event has caused the ash to be encased in recrystallized firn snow. Samples were collected at nine locations across the island. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm).
Date:February 19, 2017 3:06 PM
Photographer:Wallace, Kristi
BogoslofFieldwork operations
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Caption:Photo showing the Bogoslof ashfall deposit from 31 January 2017 as seen on 19 February during a sampling expedition on the west side of Unalaska Island. Wind and exposure to sunlight since the ashfall event has caused the ash to be encased in recrystallized firn snow. Samples were collected at nine locations across the island. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm).
Date:February 19, 2017 2:16 PM
Photographer:Wallace, Kristi
BogoslofFieldwork operations
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Caption:On February 19 AVO geologists, Janet Schaefer AVO/ADGGS and Kristi Wallace AVO/USGS, conducted helicopter-supported field investigations of the ash that fell on Unalaska Island during the January 30-31 Bogoslof eruption. Wind and exposure to sunlight since the ash fall event has caused the ash to be encased in ice and the exposed ash now appears as gray areas on the hillside. Samples were collected at nine locations across the island. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm). In this photo, Kristi Wallace samples a measured area section of ash fall.
Date:February 19, 2017 1:56 PM
Photographer:Schaefer, Janet
BogoslofEruption cloud/ plume/ column, Fieldwork operations, Tephra
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Caption:Photo from Feb 19, 2017 sampling of Bogoslof ash deposited on Jan 31, 2017 on west side of Unalaska Island. Wind and exposure to sunlight since the ashfall event has caused the deposit to have this curd-like texture in firn snow. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm).
Date:February 19, 2017 1:48 PM
Photographer:Wallace, Kristi
Bogoslof
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Caption:Janet Schaefer sampling Bogoslof ashfall deposited on Jan 31, 2017 on west side of Unalaska Island.
Date:February 19, 2017 1:47 PM
Photographer:Wallace, Kristi
Bogoslof
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Caption:On February 19 AVO geologists, Janet Schaefer AVO/ADGGS and Kristi Wallace AVO/USGS, conducted helicopter-supported field investigations of the ash that fell on Unalaska Island during the January 30-31 Bogoslof eruption. Wind and exposure to sunlight since the ash fall event has caused the ash to be encased in ice and the exposed ash now appears as gray areas on the hillside. Samples were collected at nine locations across the island. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm)
Date:February 19, 2017 1:22 PM
Photographer:Schaefer, Janet
BogoslofEruption cloud/ plume/ column, Fieldwork operations, Tephra
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Caption:On February 19 AVO geologists, Janet Schaefer AVO/ADGGS and Kristi Wallace AVO/USGS, conducted helicopter-supported field investigations of the ash that fell on Unalaska Island during the January 30-31 Bogoslof eruption. Wind and exposure to sunlight since the ash fall event has caused the ash to be encased in ice and the exposed ash now appears as gray areas on the hillside. Samples were collected at nine locations across the island. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm)
Date:February 19, 2017 11:32 AM
Photographer:Schaefer, Janet
BogoslofEruption cloud/ plume/ column, Fieldwork operations, Tephra
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Caption:Thermal infrared satellite image from 14:36 UTC (5:36 am AKST) showing the volcanic cloud produced by an eruption of Bogoslof volcano that began around 14:00 UTC. The cloud extends for about 35 km (21 miles) towards the southwest at an altitude of about 25,000 ft (7.6 km) above sea level.
Date:February 18, 2017 5:36 AM
Photographer:Schneider, Dave
Bogoslof
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Caption:Kristi Wallace, AVO/USGS, installs an air quality monitor in Unalaska.
Date:February 17, 2017 3:38 PM
Photographer:Schaefer, Janet
BogoslofEruption cloud/ plume/ column, Fieldwork operations
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Caption:Bogoslof's eruption plume, February 17, 2017, as viewed from an airplane landing in Dutch Harbor. Photo courtesy of Virginia Hatfield.
Date:February 17, 2017 11:45 AM
Photographer:Hatfield, Virginia
BogoslofEruption cloud/ plume/ column
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Caption:Bogoslof's eruption plume, February 17, 2017, as viewed from an airplane landing in Dutch Harbor. Photo courtesy of Virginia Hatfield.
Date:February 17, 2017 11:45 AM
Photographer:Hatfield, Virginia
BogoslofEruption cloud/ plume/ column
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Caption:Thermal infrared satellite image of eruption plume (center left of image) from Bogoslof volcano, February 17, 2017, 11:30 am AKST (20:30 UTC). Image via NOAA/CIMSS.
Date:February 17, 2017 11:30 AM
Photographer:Cameron, Cheryl
BogoslofEruption cloud/ plume/ column
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Caption:AVO geologists Janet Schaefer and Kristi Wallace visit Unalaska and Dutch Harbor to meet with the community and talk about ashfall from the recent Bogoslof eruption. They also installed an air quality monitoring instrument (pictured here).
Date:February 17, 2017 12:00 AM
Photographer:Schaefer, Janet
BuldirFieldwork operations, People in action
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Caption:AVO geologists Janet Schaefer and Kristi Wallace visit Unalaska and Dutch Harbor, to meet with the community and talk about ashfall from the recent Bogoslof eruption. Here they are measuring and sampling ash deposits from Bogoslof that fell on Dutch Harbor/Unalaska on January 31, 2017.
Date:February 17, 2017 12:00 AM
Photographer:Schaefer, Janet
BuldirFieldwork operations, People in action
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Caption:AVO geologists Janet Schaefer and Kristi Wallace visit Unalaska and Dutch Harbor, to meet with the community and talk about ashfall from the recent Bogoslof eruption. In this image, Kristi is also taking the opportunity to sample ashfall from the January 31, 2017 explosion.
Date:February 17, 2017 12:00 AM
Photographer:Schaefer, Janet
BuldirFieldwork operations, People in action
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Caption:Steam from the summit of Pavlof volcano. Images taken by Michael Levine, Commanding Officer of NOAA ship Oscar Dyson in Pavlof Bay, Feb. 13, 2017.
Date:February 13, 2017 1:30 PM
Photographer:Levine, Michael
PavlofSteam
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Caption:Steaming from the summit of Pavlof volcano on February 13, 2017. Photo taken from NOAA ship Oscar Dyson, approximately 25 km (16 miles) south of Pavlof.
Date:February 13, 2017 9:28 AM
Photographer:McKinney, James
PavlofSteam
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Caption:SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This ash particle is comprised of plagioclase crystal and vesicular glass. The sample was collected in Dutch Harbor, ca. 60 miles to the east from the volcano by Ginny Hatfield. SEM image was acquired using JEOL JXA-8530f electron microprobe at the Advanced Instrumentation Laboratory of the University of Alaska Fairbanks.
Date:February 12, 2017 12:00 AM
Photographer:Izbekov, Pavel
Bogoslof
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Caption:SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This is a vesicular, glassy ash particle. The sample was collected in Dutch Harbor, ca. 60 miles to the east from the volcano by Ginny Hatfield. SEM image was acquired using JEOL JXA-8530f electron microprobe at the Advanced Instrumentation Laboratory of the University of Alaska Fairbanks.
Date:February 12, 2017 12:00 AM
Photographer:Izbekov, Pavel
Bogoslof
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Caption:SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This is a vesicular, crystal-rich ash particle. The sample was collected in Dutch Harbor, ca. 60 miles to the east from the volcano by Ginny Hatfield. SEM image was acquired using JEOL JXA-8530f electron microprobe at the Advanced Instrumentation Laboratory of the University of Alaska Fairbanks.
Date:February 12, 2017 12:00 AM
Photographer:Izbekov, Pavel
Bogoslof
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Caption:SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This is a vesicular, glassy ash particle. The sample was collected in Dutch Harbor, ca. 60 miles to the east from the volcano by Ginny Hatfield. SEM image was acquired using JEOL JXA-8530f electron microprobe at the Advanced Instrumentation Laboratory of the University of Alaska Fairbanks.
Date:February 12, 2017 12:00 AM
Photographer:Izbekov, Pavel
Bogoslof
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Caption:SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This is a vesicular, crystal-rich ash particle. The sample was collected in Dutch Harbor, ca. 60 miles to the east from the volcano by Ginny Hatfield. SEM image was acquired using JEOL JXA-8530f electron microprobe at the Advanced Instrumentation Laboratory of the University of Alaska Fairbanks.
Date:February 12, 2017 12:00 AM
Photographer:Izbekov, Pavel
Bogoslof
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