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The slopes of Smith Creek valley, east of Mount St. Helens, show trees blown down by the lateral blast. Two U.S. Geological Survey scientists (lower right) give scale. The direction of the blast, shown here from left to right, is apparent in the alignment of the downed trees. Over four billion board feet of usable timber, enough to build 150,000 homes, was damaged or destroyed.
-- USGS Photo by Lyn Topinka, September 24, 1980

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Blowdown on Elk Rock, North Fork Toutle River Valley. The blast went from right to left, note the "singed" trees on the backside of Elk Rock.
-- USGS Photo by Lyn Topinka, August 22, 1980

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