Aerial view of the southwest flank of Kasatochi volcano, August 22, 2008. Fine-grained pyroclastic surge and fall deposits produced during the waning stages of the eruption mantle the surface. These deposits are about 1-2 m thick and overlie much coarser grained pyroclastic-flow deposits emplaced as hot, fast-moving granular flows. The pyroclastic flows deposited gravelly material on the flanks of the volcano and extended the shoreline about 400 m. The prominent cliff like feature that rims the lower third of the volcano is a wave cut cliff along the former shoreline. Tide gage data from nearby Adak Island indicates that a 20 cm amplitude tsunami was associated with the eruption and most likely was initiated when the pyroclastic flows entered the sea.
Image courtesy of AVO/USGS.
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