Plume from Bogoslof on February 19, 2017, seen from Unalaska Island, 53 miles east-southeast of the volcano. This photo, captured from a helicopter during fieldwork by the Alaska Volcano Observatory, was taken 14 minutes after this particular explosive event began. Credit: Janet Schaefer and the Alaska Volcano Observatory / Alaska Division of Geological & Geophysical Surveys

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Plume from Bogoslof on February 19, 2017, seen from Unalaska Island, 53 miles east-southeast of the volcano. This photo, captured from a helicopter during fieldwork by the Alaska Volcano Observatory, was taken 14 minutes after this particular explosive event began. Credit: Janet Schaefer and the Alaska Volcano Observatory / Alaska Division of Geological & Geophysical Surveys

Plume from Bogoslof on February 19, 2017, seen from Unalaska Island, 53 miles east-southeast of the volcano. This photo, captured from a helicopter during fieldwork by the Alaska Volcano Observatory, was taken 14 minutes after this particular explosive event began. Credit: Janet Schaefer and the Alaska Volcano Observatory / Alaska Division of Geological & Geophysical Surveys

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