On the morning of May 18, 1980, the Mount St. Helens volcano in the forests of Washington State exploded. First, months of building interior pressure triggered a massive landslide removing entire north face of the mountain. This avalanche was followed immediately by a violent eruption that ultimately expelled over a quarter-billion cubic yards of magma. Beginning in 1981 and continuing until 1990, photographer Frank Gohlke made regular visits to the devastated land around Mount St. Helens. (s. http://www.frankgohlke.com/html/books.htm).