May 18, 1980: Mount St. Helens erupts

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34th Anniversary: Mount St. Helens eruption
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  • 34th Anniversary: Mount St. Helens eruption
  • 34th Anniversary: Mount St. Helens eruption
  • 34th Anniversary: Mount St. Helens eruption
  • 34th Anniversary: Mount St. Helens eruption
  • 34th Anniversary: Mount St. Helens eruption
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34th Anniversary: Mount St. Helens eruption
Geologist Dave Johnston with gas-detection instrument at Mount St. Helens. Skamania County, Washington. April 4, 1980. (Courtesy USGS)