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Mount St. Helens, located in southwestern Washington about 50 miles northeast of Portland, Oregon, is one of several lofty volcanic peaks that dominate the Cascade Range of the Pacific Northwest; the range extends from Mount Garibaldi in British Columbia, Canada, to Lassen Peak in northern California.
Causes of the eruption Mount St. Helens sits on the plate boundary between Juan de Fuca and the North American plates (map above). The boundary is part of the so-called âRing of Fireâ - the string of volcanoes that congregate around the margin of the Pacific Ocean.auses of the eruption Mount St. Helens sits on the plate boundary between Juan de Fuca and the North American plates (map above). The boundary is part of the so-called âRing of Fireâ - the string of volcanoes that congregate around the margin of the Pacific Ocean.