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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: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: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:Analysis of shoreline changes at Bogoslof volcano due to eruptive activity. The base image is from 24 January 2017 and the shorelines on 30 and 31 January 2017 are noted by the blue and red dashed lines, respectively. Note that the 31 January analysis was conducted after the explosive event on that day. The vent for the 31 January activity is located approximately in what was the northern portion of the bay in the base image.
Date:January 31, 2017 12:00 AM
Photographer:Angeli, Kim
Bogoslof
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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: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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Caption:Bogoslof volcano, 26 January 2017. Photo courtesy of Tim Deal.
Date:January 26, 2017 12:00 AM
Photographer:Deal, Tim
BogoslofCaldera/crater
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Caption:Satellite image of Bogoslof Volcano, taken January 24, 2017. Inset image of the Rose Bowl, in Pasadena, CA to show the scale of Bogoslof. The base image is a Worldview-2 satellite image collected on January 24, 2017. Image created by Dave Schneider, USGS/AVO.
Date:January 24, 2017 12:00 AM
Photographer:Schneider, Dave
BogoslofCaldera/crater, Maar/tuff cone/tuff ring
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Caption:Worldview-2 satellite image of Bogoslof volcano collected on January 24, 2017. The vent for the numerous explosions is located underwater in the bay. Upwelling of volcanic can be observed in the north part of the bay. Discoloration in the water is due to suspended sediment.
Date:January 24, 2017 12:00 AM
Photographer:Schneider, Dave
ArrayVolcano
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Caption:Index map showing the location of Takawangha volcano, Alaska.
Date:January 24, 2017 12:00 AM
Photographer:Alaska Volcano Observatory
Takawangha
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Caption:Analysis of shoreline changes at Bogoslof volcano due to eruptive activity between January 11 and 24, 2017. The base image is a Worldview-2 satellite image collected on January 24, 2017. The approximate location of the shoreline on January 11, 2017 is shown by the dashed orange line.
Date:January 24, 2017 12:00 AM
Photographer:Schneider, Dave
BogoslofVolcano
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Caption:Bogoslof's 18 January 2017 eruption plume, taken at 1:29 pm AKST, visible from FAA's west-facing webcam in Dutch Harbor.
Date:January 18, 2017 1:29 PM
Photographer:FAA Dutch NDB- West,
BogoslofEruption cloud/ plume/ column
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Caption:True color satellite image from 1:26 AKST (22:26 UTC) on 18 January 2017 showing the volcanic ash cloud from Bogoslof volcano. The altitude of the cloud was reported by pilots at greater than 31,000 ft above sea level.
Date:January 18, 2017 1:26 AM
Photographer:Schneider, Dave
BogoslofEruption cloud/ plume/ column
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Caption:Image of Bogoslof's 18 January 2017 eruption plume, as seen from Dutch Harbor, AK. Dutch Harbor is about 60 miles (98 km) east of Bogoslof. Image courtesy of Victor Fisher.
Date:January 18, 2017 12:00 AM
Photographer:Fisher, Victor
BogoslofEruption cloud/ plume/ column
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Caption:Image of Bogoslof's 18 January 2017 eruption plume, as seen from Dutch Harbor, AK. Dutch Harbor is about 60 miles (98 km) east of Bogoslof. Image courtesy of Victor Fisher.
Date:January 18, 2017 12:00 AM
Photographer:Fisher, Victor
BogoslofEruption cloud/ plume/ column
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Caption:Analysis of shoreline changes at Bogoslof volcano due to eruptive activity. The base image is from 11 January 2017 and the shore line on 16 and 18 January 2017 are noted by the green and salmon dashed lines, respectively. Note that the 18 January analysis was conducted before the explosive event on that day.
Date:January 18, 2017 12:00 AM
Photographer:Angeli, Kim
Bogoslof
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Caption:Image of Bogoslof's 18 January 2017 eruption plume, as seen from Dutch Harbor, AK. Dutch Harbor is about 60 miles (98 km) east of Bogoslof. Image courtesy of Victor Fisher.
Date:January 18, 2017 12:00 AM
Photographer:Fisher, Victor
BogoslofEruption cloud/ plume/ column
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Caption:A small eruption plume from the January 12 explosion at Bogoslof volcano punches through the ~12,000 ft asl cloud deck as seen in this MODIS satellite image. Note the shadow of the plume on the cloud top to the northwest.
Date:January 12, 2017 12:34 PM
Photographer:Schaefer, Janet
BogoslofEruption cloud/ plume/ column
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Caption:Worldview-2 satellite image of Bogoslof volcano collected on January 11, 2017. The vent for the numerous explosions is located underwater in the bay. Discoloration in the water is due to suspended sediment.
Date:January 11, 2017 12:00 AM
Photographer:Schneider, Dave
BogoslofVolcano
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Caption:Photo of Bogoslof Island taken by Dan Leary of Maritime Helicopters on 10 January 2017. View is to the north and an upwelling can be seen near the center of the southeast facing bay, possibly marking the approximate location of the shallow submarine vent.
Date:January 10, 2017 3:05 PM
Photographer:Leary, Dan
BogoslofSeamount/ submarine volcano, Volcano
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