USGS/Cascades Volcano Observatory, Vancouver, Washington

Mount St. Helens, Washington
May 18, 1980, Ash Fallout Distribution within the U.S.

This generalized map shows the distribution of ash fallout from the May 18, 1980 eruption. -- Modified from: Tilling, Topinka, and Swanson, 1990, Eruptions of Mount St. Helens: Past, Present, and Future: USGS Special Interest Publication

Map, May 18, 1980 Ash Fallout Distribution

Map, May 18, 1980 Ash Fallout Distribution

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02/10/08, Lyn Topinka

Mount St. Helens, Washington May 18, 1980, Ash Fallout Distribution within the U.S.

Mount St. Helens, Washington
May 18, 1980, Ash Fallout Distribution within the U.S.