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IMAGE 135891
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Helicorder style record from station GSSP showing 24-hours of data starting at 18:00 UTC on July 21, 2017. Suspected explosions begins at 00:17 UTC and is followed by numerous small earthquakes.

Date: July 21, 2017 12:00 AM
Volcano(es):Great Sitkin
Photographer/Creator: Dixon, Jim

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Page modified: September 17, 2018 11:25
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