Alaska Volcano Observatory

Seismic signal from October 2014 rockfall off the eastern headwall of Iliamna Volcano, from below the NE fumaroles. The debris ran about 2km down the upper Red Glacier. The slide happened at 0316 UTC on Oct 3 2014 (7:16 pm Oct 2nd local time). Plot shows 90 sec of seismic data. The waveforms have the classic emergent onset and taper of a rockfall and subsequent mixed rock and snow slide on a glacier. Reported with help from Jackie Caplan-Auerbach and Rick Wessels.

Image courtesy of the AVO/UAF-GI.
Please cite the photographer and the Alaska Volcano Observatory / University of Alaska Fairbanks, Geophysical Institute when using this image.
Full Resolution.