Image of Mount Saint Helens viewed from the north on June 4, 1980.

"Mount Saint Helens viewed from the north on June 4, 1980. The huge U-shaped basin formed by the landslide and the initial blast was nearly two miles long and one mile wide. The mountain was lowered 1,300 feet. Ash covered slopes, and extensive mudflows are visible in the photograph. Mudflows dumped more than 75 million cubic yards of sediment into rivers, valleys, and reservoirs. Several pyroclastic flows left about 0.05 cubic mile of deposits in this area. About 230 square miles were devastated by the eruption." (U.S. Dept. of Commerce, 1980, p. 4) Photo: Courtesy of NGDC/NOAA.

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