Image of uprooted trees in the ash-covered Green River valley and a small debris flow is also visible.

"Uprooted trees in the ash-covered Green River valley. A small debris flow is visible on the left. Trees amounting to more than 4 billion board feet of salable timber were damaged or destroyed by the near-supersonic lateral blast of rock, ash, and hot gases. The blast devastated an area of about 230 square miles in a fan-shaped sector north of the volcano. At least 25 percent of the damaged timber was later salvaged. The photo was taken on May 24, 1980." (U.S. Dept. of Commerce, 1980, p. 5) Photo: Courtesy of NGDC/NOAA.

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