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: Jul 21st, 2017
Volcano(es): Great Sitkin
Photographer: Dixon, Jim
URL: avo.alaska.edu/image/view/135891
Volcano(es): Great Sitkin
Photographer: Dixon, Jim
URL: avo.alaska.edu/image/view/135891
Full Resolution.