This poster shows the sixteen major volcanoes of the Cascade Volcanic Arc, resulting from plate subduction along the west coast of North America. The Garibaldi Volcanic Belt is just an extension of the Volcanic Arc into Canada. These are the volcanoes that are classified a “potentially active” by the USGS; all but four of them (Cayley, Garibaldi, Jefferson, and Crater Lake) have recorded volcanic activity during the past 4,000 years. The most recent major eruption was of Mt. St. Helens in May 1980; the gaping crater of Mt. St. Helens is displayed in the background image of this poster. Other volcanic formations and dormant volcanic peaks are not shown on the map. The poster was created by Steph Abegg, 2011, using a modified image from the USGS website.
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