The June 5, 2021 Sentinel-2 SWIR image of the summit of Great Sitkin volcano. The short-wave infrared (SWIR) image shows a few still hot areas (in red) around the active crater. The light brown appearing deposits are probably pyroclastic density current deposits associated with fall back from the eruption column. These deposits flowed short distance from the crater and likely interacted with the snowpack (light blue in color) to form meltwater. The meltwater entrained available pyroclastic sediment and evolved to a volcanic mudflow or lahar that travelled a short distance (about 1300 m) on the upper edifice. Had the May 25 eruption be larger and longer lasting, Glacier Creek valley to the southwest of the lahar deposit could have been inundated by volcanic mass flows.
Image courtesy of AVO/USGS.
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