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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: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: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 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, 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:On the right, a COSMO SkyMed Synthetic Aperture Radar (SAR) satellite image from 8 February showing that the vent location at Bogoslof is still underwater. A Sentinel-2 visible image from 2 February is shown on the left for reference. Please note that SAR images have significant geometric distortion, so a direct comparison between features is not straightforward.
Date:February 8, 2017 12:00 AM
Photographer:Schneider, Dave
Bogoslof
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Caption:Changes in the configuration of Bogoslof Island resulting from the ongoing 2016-17 eruption. The January 30-31, 2017 eruptive activity generated roughly 0.4 square kilometers of new land and as of January 31, 2017, the island area was 1.02 square kilometers, roughly three times the size of the pre-eruption island. Nearly all of this new material consists of unconsolidated pyroclastic fall and flow (surge) deposits that are highly susceptible to wave erosion and thus additional changes in the configuration of the island are likely.
Date:February 2, 2017 12:00 AM
Photographer:waythomas, chris
BogoslofMaar/tuff cone/tuff ring
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Caption:Satellite image of Bogoslof volcano acquired on February 2, 2017. Note that the vent for the explosive eruptions was underwater once again at this time, compared to a previous image from January 31, 2017 that showed a deep crater. This is likely due to the inflow of ocean water through the porous ash fall deposits as the bottom of the crater on January 31 was below sea level. This image was acquired prior to several modest explosive events on February 3, 2017, which may have resulted in additional crater and island landform changes.
Date:February 2, 2017 12:00 AM
Photographer:Schneider, Dave
BogoslofCaldera/crater, Lake
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Caption:Trace ashfall on vehicle at Unalaska, 31 January 2017. Photo courtesy of Virginia Hatfield.
Date:January 31, 2017 10:41 AM
Photographer:Hatfield, Virginia
BogoslofTephra
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Caption:Collecting an ashfall sample of trace ashfall at Unalaska, from Bogoslof volcano, 31 January 2017. Photo courtesy of Virginia Hatfield.
Date:January 31, 2017 10:40 AM
Photographer:Hatfield, Virginia
BogoslofTephra
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Caption:Trace ashfall at Unalaska, from Bogoslof Volcano, 31 January 2017. Photo courtesy of Zoë Sobel/KUCB.
Date:January 31, 2017 10:14 AM
Photographer:Sobel, Zoe
BogoslofTephra
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Caption:Trace ashfall at Unalaska, from Bogoslof Volcano, 31 January 2017. Photo courtesy of Zoë Sobel/KUCB.
Date:January 31, 2017 10:04 AM
Photographer:Sobel, Zoe
BogoslofTephra
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Caption:Trace ashfall at Unalaska, from Bogoslof Volcano, 31 January 2017. Photo courtesy of Zoë Sobel/KUCB.
Date:January 31, 2017 10:04 AM
Photographer:Sobel, Zoe
BogoslofTephra
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Caption:Trace ashfall at Unalaska, from Bogoslof Volcano, 31 January 2017. Photo courtesy of Zoë Sobel/KUCB.
Date:January 31, 2017 10:03 AM
Photographer:Sobel, Zoe
BogoslofTephra
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Caption:Trace ashfall at Unalaska from Bogoslof volcano, 31 January 2017. Photo courtesy of Virginia Hatfield.
Date:January 31, 2017 9:28 AM
Photographer:Hatfield, Virginia
BogoslofTephra
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Caption:Trace ashfall at Unalaska, 31 January 2017, from Bogoslof volcano. Photo courtesy of Virginia Hatfield.
Date:January 31, 2017 8:59 AM
Photographer:Hatfield, Virginia
BogoslofTephra
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Caption:Trace ashfall in Unalaska, 31 January 2017. Photo courtesy of Andy Dietrick.
Date:January 31, 2017 7:57 AM
Photographer:Dietrick, Andy
BogoslofTephra
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Caption:Ashfall in Unalaska, 31 January 2017. Photo courtesy of Andy Dietrick.
Date:January 31, 2017 5:59 AM
Photographer:Dietrick, Andy
BogoslofTephra
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Caption:Ashfall in Unalaska, 31 January 2017. Photo courtesy of Andy Dietrick.
Date:January 31, 2017 5:58 AM
Photographer:Dietrick, Andy
BogoslofTephra
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Caption:Eruption plume (marked with black arrows) from Bogoslof volcano, 01:15 am 31 Jan 2017 AKST (10:15 am 31 Jan 2017 UTC), as seen in GOES-15 infrared imagery.
Date:January 31, 2017 1:15 AM
Photographer:Schneider, Dave
BogoslofEruption cloud/ plume/ column
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Caption:Features and deposits on Bogoslof Island after the eruptive events of January 30-31, 2017. Shallow groundwater flow through the new volcanic deposits from the sea toward the center depression has resulted in the formation of concentric headscarps and channels. This process, called sapping, is common in areas of concentrated groundwater discharge where it undermines slopes and leads to headward erosion and the formation of arcuate headscarps. Rubbly appearing rock debris scattered over parts of the island was likely generated by near surface explosions of a still submarine lava plug, showering the island with blocks and bombs of rock debris. Some of these rock fragments are up to 2.5 m in length. The mound of tephra on the southern part of the island is a tuff cone, and the level area making up the northern half of the island is a tuff ring. These are characteristic landforms of shallow submarine eruptions. The Bogoslof Island landscape is susceptible to rapid erosion, primarily by ocean waves, and erosion of the surficial volcanic deposits will be ongoing and changes in the configuration of the island are likely. ©2017 Digital Globe NextView License. Base image Worldview-3, 1/31/2017.
Date:January 31, 2017 12:00 AM
Photographer:waythomas, chris
BogoslofMaar/tuff cone/tuff ring
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Caption:Ashfall in the Pyramid Valley in Unalaska, 31 January 2017. Photo courtesy of Andy Dietrick.
Date:January 31, 2017 12:00 AM
Photographer:Dietrick, Andy
BogoslofTephra
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Caption:Video of infrasound data (top) and spectrogram data (bottom), from Bogoslof Volcano on 31 January 2017. 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 explosions at the beginning of the eruption, transitioning to sustained jetting. Data recorded at an infrasound array on Umnak Island from 05:30 UTC - 12:30 UTC. Video created by David Fee, UAFGI/AVO. Non-flash version of video is posted on AVO facebook page at https://www.facebook.com/alaska.avo/videos/1246762972084882/
Date:January 31, 2017 12:00 AM
Photographer:Fee, David
BogoslofEruption cloud/ plume/ column
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