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Global Volcanism Program | Image GVP-02857

On 11 April 1980, two weeks after the 27 March beginning of the eruption of Mount St. Helens, an area of fractured glacial ice is visible at the top of the volcano. Thin black streaks of volcanic mudflows are visible at the center and lower left that diverge around the undisturbed snowpack on Sugar Bowl lava dome. Photo by William Melson, 1980 (Smithsonian Institution).

On 11 April 1980, two weeks after the 27 March beginning of the eruption of Mount St. Helens, an area of fractured glacial ice is visible at the top of the volcano. Thin black streaks of volcanic mudflows are visible at the center and lower left that diverge around the undisturbed snowpack on Sugar Bowl lava dome.

Photo by William Melson, 1980 (Smithsonian Institution).

Keywords: tephra | ashfall | ash | deposit


St. Helens