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Geology
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Generalized Geologic Map of the Conterminous United States
North America Shaded Relief
 

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  The North American Tapestry of Time and Terrain

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Mount Saint Helens

  Close-up of
 mount saint helens region

 

Mount St. Helens, in eastern Washington, erupted catastrophically in 1980. Apparently triggered by a magnitude 5.1 earthquake, the northern part of the volcano collapsed, creating a huge avalanche of debris immediately followed by an eruption. 57 people were killed as a result. The volcano is difficult to discern on the Tapestry at this scale and lies largely hidden among the many peaks in the Cascade Range in southwest Washington.