UNREST AT SHISHALDIN VOLCANO

February/March, 1999

Shishaldin Image Gallery - April 23, 1999 photos

The following photographs were taken by Game McGimsey (AVO - USGS) on April 23, 1999, from an Alaska State Trooper airplane. These photographs were taken about 10 hours after the 3rd and largest (to date) eruption.

	A small ash plume rises above the ash covered summit of Shishaldin Volcano on Friday, April 23rd, 1999. The photograph was taken about 10 hours after the previous major eruptive episode ended. (4/23/99. G. McGimsey, AVO/USGS.)
	Summit of Shishaldin mantled by airfall ash and mass flows 10 hours after the end of the previous major eruptive episode. Infrared sensors mounted in the Alaska State Troopers aircraft showed that some of the deposits were still warm. The summit of Shishaldin is normally completely covered by snow and ice at this time of year. (4/23/99. G. McGimsey, AVO/USGS.)
	Summit of Shishaldin mantled by airfall ash 10 hours after the end of the previous major eruptive episode. The back (north) side of the volcano is draped with clouds. The summit of Shishaldin is normally completely covered by snow and ice at this time of year. (4/23/99. G. McGimsey, AVO/USGS)
	Summit of Shishaldin mantled by airfall ash 10 hours after the end of the previous major eruptive episode. The back (north) side of the volcano is draped with clouds. Satellite imagery showed a large thermal anomaly, presumably associated with these still-warm fall and flow deposits, immediately after the eruption. (4/23/99. G. McGimsey, AVO/USGS)
	Summit of Shishaldin mantled by airfall ash 10 hours after the end of the previous major eruptive episode. The back (north) side of the volcano is draped with clouds The summit of Shishaldin is normally completely covered by snow and ice at this time of year. (4/23/99. G. McGimsey, AVO/USGS)