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AVO IMAGE DATABASE
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Caption:Comparison of Bogoslof Island before the 2016-17 eruption to March 11, 2017 configuration. As of March 7-8, 2017, there have been 36 eruptive events since Dec. 12, 2016. Main geographic points of reference are labelled in each image and point A is the same in both images. Image data provided under Digital Globe NextView License.
Date:March 15, 2017 12:00 AM
Photographer:waythomas, chris
BogoslofMaar/tuff cone/tuff ring, Seamount/ submarine volcano, Tephra
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Caption:Bogoslof Volcano with significant steaming, as viewed from a flight from Atka, AK to Dutch Harbor, AK. Photo courtesy of Dave Eilertsen.
Date:March 13, 2017 2:02 PM
Photographer:Eilertsen, Dave
BogoslofSteam
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Caption:Worldview-2 satellite image of Bogoslof volcano collected on March 11, 2017 at 22:15 UTC (1:15 PM AKST). Eruptive activity on March 8 produced large changes in the shape and size of the island. The most active vent for the explosive activity is located under the water in the center of the island, and it was greatly enlarged by the March 8 event. The western coastline has grown, and a new vent was produced on the north shore of the island. Image data provided under Digital Globe NextView License.
Date:March 11, 2017 10:55 PM
Photographer:Schneider, Dave
Bogoslof
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Caption:Worldview satellite images of Bogoslof volcano collected on March 3 and March 11, 2017 showing changes to the island due to eruptive activity on March 8, 2017. The central lake that is the site of the underwater vent is greatly expanded, deposition of volcanic ash and blocks has expanded the island's west shoreline, and a new small vent was formed on the north shore of the island. Image data provided under the Digital Globe NextView License.
Date:March 11, 2017 12:00 AM
Photographer:Schneider, Dave
Bogoslof
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Caption:March 11, 2017 Worldview-2 satellite image of Bogoslof Island showing features and changes resulting from the March 7-8 eruption. A new vent developed on the northwest shore of the island adjacent to the lava dome that formed during the 1992 eruption. Most of the deposits on the surface appear fine grained and were likely emplaced by pyroclastic base surges. The surface of these deposits exhibit ripples, dunes and ballistic impact craters. The scalloped appearing shoreline of the intra-island lake is probably the result of groundwater related erosion (sapping) of the pyroclastic deposits as water refills the lake. Most or all of the water in the lake was likely expelled by the eruption column exiting the primary or other vents. The area of Bogoslof Island in this image is about 0.98 square kilometers. Image data provided under Digital Globe NextView License.
Date:March 11, 2017 12:00 AM
Photographer:waythomas, chris
BogoslofMaar/tuff cone/tuff ring, Seamount/ submarine volcano
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Caption:Recent road cut along Summer Bay Pass Road near Unalaska exposing January 31, 2017 ashfall layer within the snow from Bogoslof volcano.
Date:March 10, 2017 12:00 AM
Photographer:Woodbridge, Abi
Bogoslof
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Caption:Photo of ashfall on the snow, Nateekin Bay near Unalaska about a week after the eruption of Bogoslof on January 31, 2017.
Date:March 8, 2017 3:51 PM
Photographer:Dietrick, Andy
BogoslofTephra
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Caption:Photo of ashfall on the snow, Nateekin Bay near Unalaska about a week after the eruption of Bogoslof on January 31, 2017.
Date:March 8, 2017 3:51 PM
Photographer:Dietrick, Andy
BogoslofTephra
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Caption:Photo of ashfall on the snow, Nateekin Bay near Unalaska about a week after the eruption of Bogoslof on January 31, 2017.
Date:March 8, 2017 3:51 PM
Photographer:Dietrick, Andy
BogoslofTephra
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Caption:Thermal infrared satellite image of the volcanic ash cloud (dark grey and red) at 12:15 UTC (3:15 AM AKST) on 8 March 2017. This cloud was at an altitude of at least 35,000 ft above sea level.
Date:March 8, 2017 12:15 PM
Photographer:Schneider, Dave
Bogoslof
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Caption:There were 220 volcanic lightning strokes detected by the WWLLN network from 8:13–10:34 UTC, during the March 8, 2017 eruption of Bogoslof volcano.
Date:March 8, 2017 10:33 AM
Photographer:Van Eaton, Alexa
BogoslofLightning
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Caption:Thermal infrared satellite image of the volcanic ash cloud (dark grey and red) at 09:45 UTC (12:45 AM AKST) on 8 March 2017. This cloud was at an altitude of at least 35,000 ft above sea level.
Date:March 8, 2017 9:45 AM
Photographer:Schneider, Dave
Bogoslof
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Caption:Seismic and infrasound data from the 8 March 2017 Bogoslof eruption sequence (#36). The top figure is 4.5 hours of seismic data from a station on Makushin Volcano, and the bottom figure is 4.5 hours of infrasound data from a station on Okmok Volcano. The eruption began at 07:36 UTC (7 March 22:36 AKST) and lasted approximately 3 hours. During the eruption, a cloud visible in satellite data was produced that reached at least 35,000 feet above sea level. Hundreds of lightning strokes were also produced during the course of the eruption, with the first detection at 08:13 UTC (23:13 AKST) and the last detection at 10:33 UTC (8 March 01:33 AKST). Infrasound produced by the eruption was initially dominated by discrete events, but changed to a more sustained signals with higher frequency energy around 09:28 UTC (8 March 00:28 AKST). This change may have occurred as tephra built up around the vent area, greatly reducing the influence of sea water on the eruption.
Date:March 8, 2017 7:36 AM
Photographer:Lyons, John
BogoslofCaldera/crater, Eruption cloud/ plume/ column, Infrasound, Lightning, Seamount/ submarine volcano, Tephra, Volcano
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Caption:Digital elevation model (DEM) and satellite image of Bogoslof Island, February 23, 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:February 23, 2017 12:00 AM
Photographer:waythomas, chris
BogoslofMaar/tuff cone/tuff ring, Seamount/ submarine volcano
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Caption:Worldview-2 satellite images of Bogoslof Island, February 12 and 23, 2017. Between February 12-23, there were 5 eruptive events, but it is difficult to tell how much pyroclastic material may have been added to the island as a result of this activity. The main changes evident in the February 23 image are related to wave erosion of the outer coastline. Another feature not clearly evident in satellite images prior to February 23 is an area of low-level point source steaming and possible fumaroles in the low area near the southeastern sector of the enclosed lake. The differences in island area are probably not significant and are likely related to tide level. ©2017 Digital Globe NextView License. Base images Worldview-2, 2/12/2017 and 2/23/17.
Date:February 23, 2017 12:00 AM
Photographer:waythomas, chris
BogoslofFumarolic activity, Maar/tuff cone/tuff ring
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Caption:February 19 Bogoslof eruption plume as seen from Unalaska Island, 53 miles ESE of Bogoslof volcano. Photo taken from helicopter during fieldwork by AVO geologists at 5:22PM, approximately 14 minutes after the start of the eruption.
Date:February 19, 2017 5:22 PM
Photographer:Schaefer, Janet
BogoslofEruption cloud/ plume/ column
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Caption:First glimpse of the Bogoslof eruption cloud by Janet Schaefer and Jon Combs at 18:19 AKST on 19 Feb 2017 while on the ground sampling ash on the west side of Unalaska Island.
Date:February 19, 2017 5:19 PM
Photographer:Wallace, Kristi
BogoslofEruption cloud/ plume/ column
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Caption:Site visit to MREP, Feb. 19, 2017, during Bogoslof ash sampling fieldwork. Ice and snow were removed from the swing set solar panels and from the lower parts of the antennae.
Date:February 19, 2017 4:47 PM
Photographer:Schaefer, Janet
MakushinFieldwork operations, Seismic/GPS installation
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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 4:39 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 4:13 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 4:13 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 exposure has reworked the deposit in this location and it appears as multiple layers. 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 4:09 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 3:35 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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