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Caption:Photo of Bogoslof ashfall deposit on 31 Jan 2017 in Unalaska, Alaska. Photo courtesy of Tom Cohenour.
Date:January 31, 2017 12:01 PM
Photographer:Wallace, Kristi
BogoslofTephra
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Caption:Photo of Bogoslof ashfall deposit on 31 Jan 2017 in Unalaska, Alaska. Photo courtesy of Tom Cohenour.
Date:January 31, 2017 11:59 AM
Photographer:Wallace, Kristi
BogoslofTephra
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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: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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Caption:Satellite image of Bogoslof volcano collected on 31 January 2017 showing the significant changes at Bogoslof Island following the eruption during the night of 30 to 31 January. Freshly erupted volcanic rock and ash have formed a barrier that separates the vent from the sea. This is the first time this has been observed since the eruptive sequence began in mid-December 2016. The vent is below sea level, and erosion of the ash deposits by wave or eruptive processes would allow sea water to flow into the vent again.
Date:January 31, 2017 12:00 AM
Photographer:Schneider, Dave
BogoslofCaldera/crater, Tephra
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Caption:Digital elevation model (DEM) and satellite image of Bogoslof Island, January 31, 2017. The DEM was generated by Angie Diefenbach, USGS, Cascades Volcano Observatory from stereo WorldView satellite images. Image data provided under Digital Globe NextView License.
Date:January 31, 2017 12:00 AM
Photographer:waythomas, chris
BogoslofMaar/tuff cone/tuff ring, Seamount/ submarine volcano
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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:MODIS satellite image from 11:32 pm 30 Jan 2017 AKST (08:32 am 31 Jan 2017 UTC) shows a continuous plume extending over Unalaska Island, from Bogoslof volcano (red circle).
Date:January 30, 2017 11:32 PM
Photographer:Schneider, Dave
BogoslofEruption cloud/ plume/ column
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Caption:MODIS Thermal infrared satellite image showing a 135 km long eruption plume from the Jan. 31 UTC (Jan. 30-31 AKST) eruption of Bogoslof volcano.
Date:January 30, 2017 11:32 PM
Photographer:Schaefer, Janet
BogoslofEruption cloud/ plume/ column
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Caption:Bogoslof eruption plume (black circle), as seen in satellite imagery, 9:30 pm 30 Jan 2017 AKST (06:30 am 31 Jan 2017 UTC).
Date:January 30, 2017 9:30 PM
Photographer:Schneider, Dave
BogoslofEruption cloud/ plume/ column
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Caption:Morphologic changes in the size and shape of Bogoslof Island resulting from the eruptive activity of 2016-17 as of January 24, 2017. Island outlines derived from satellite images. Location of the active vent is approximate.
Date:January 27, 2017 12:00 AM
Photographer:waythomas, chris
BogoslofSeamount/ submarine volcano
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Caption:Bogoslof volcano, 26 January 2017. Photo courtesy of Tim Deal.
Date:January 26, 2017 4:00 PM
Photographer:Deal, Tim
BogoslofCaldera/crater
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Caption:On January 23, 2017, after an energetic earthquake swarm was detected on Tanaga Island, the Alaska Volcano Observatory raised the aviation color code to YELLOW and the alert level to Advisory. As of January 26, earthquakes continue to be located within 6 to 7 km of Takawangha volcano. No activity has been detected at the volcano in satellite data.
Date:January 26, 2017 12:00 AM
Photographer:Schaefer, Janet
Takawangha, Tanaga
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