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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 plagioclase crystal with a thin coat of vesicular glass on top of it. 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:Digital elevation model (DEM) and satellite image of Bogoslof Island, February 12, 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 12, 2017 12:00 AM
Photographer:waythomas, chris
ArrayMaar/tuff cone/tuff ring, Seamount/ submarine volcano
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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. The angular ash particle in the middle is an amphibole crystal. 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: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 an individual plagioclase crystal. 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:SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This is an expanded view of vesicles of the crystal-rich ash particle shown on image #104971. 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:Features and deposits on Bogoslof Island as of February 12, 2017. Based on analysis of this image, it appears that no significant pyroclastic deposits were emplaced on the island during eruptive activity between January 31 and February 12, 2017. The main changes since January 31 (the date of the last high-resolution satellite view of the island) are primarily a result of wave erosion and enlargement of the shallow seawater lake in the center of the island. The Bogoslof Island landscape will continue to be modified by ocean waves, and further changes in the configuration of the island are likely. ©2017 Digital Globe NextView License. Base image Worldview-2, 2/12/2017.
Date:February 12, 2017 12:00 AM
Photographer:waythomas, chris
BogoslofMaar/tuff cone/tuff ring
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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:SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This is a low magnification image showing major morphological types of ash particles. 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: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. Since then the area of the island has declined slightly due to wave erosion and expansion of the shallow seawater lake in the middle of the island. Eruptive activity since January 31 does not appear to have contributed much if any new pyroclastic fall and flow (surge) deposits to the island. If no new eruptive material is added to the island, wave action will begin to gradually erode the outer coastline.
Date:February 12, 2017 12:00 AM
Photographer:waythomas, chris
BogoslofMaar/tuff cone/tuff ring, Seamount/ submarine volcano
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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:Geologic cross section and conceptual model of the features and deposits observed in January 31, 2017 Worldview-3 satellite image of Bogoslof Island. Features not to scale in the vertical dimension. Subsurface features inferred from observations at Bogoslof and other shallow submarine volcanoes and their eruptions. The exsolution of magmatic volatiles and magma-water-wet sediment interaction probably initiates some amount of convection and density driven circulation (shown by orange arrows) within the vent-filling debris.
Date:February 3, 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: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:Photo of ashfall on the snow in Pyramid valley near Unalaska from the eruption of Bogoslof volcano on January 31, 2017. Notice that the ash is much darker on the aspects facing the west (in the direction of Bogoslof).
Date:January 31, 2017 4:59 PM
Photographer:Dietrick, Andy
ArrayTephra
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Caption:Photo of ashfall on the snow in Pyramid valley near Unalaska from the eruption of Bogoslof volcano on January 31, 2017. Notice that the ash is much darker on the aspects facing the west (in the direction of Bogoslof).
Date:January 31, 2017 3:45 PM
Photographer:Dietrick, Andy
BogoslofTephra
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Caption:Photo of ashfall on the snow in Pyramid valley near Unalaska from the eruption of Bogoslof volcano on January 31, 2017. Notice that the ash is much darker on the aspects facing the west (in the direction of Bogoslof).
Date:January 31, 2017 3:41 PM
Photographer:Wallace, Kristi
BogoslofTephra
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