Eruption activity on March 24, 1980 with a series of earthquakes with steam and ash eruptions following on March 27, 1980. Mount St. Helens, Skamania County, Washington. 1980.

Index card: Eruption activity began on March 24, 1980 with a series of earthquakes. On March 27, 1980 steam and ash eruptions occurred. Two craters appeared on the peak which eventually came together forming one large crater. Running across the peak of the volcano in this oblique aerial view one can see the large crack that developed in the ice. In the right foreground is a massive bulge of material moving out as a result of pressure from within the volcano. Skamania County, Washington. March 30, 1980. (Photo by Austin Post, USGS/Glaciology).