Tornado Alley (PROG)

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Shudder .. The Cascadia subduction zone (also referred to as the Cascadia fault) is a subduction zone, .. http://en.wikipedia.org/wiki/Subduction_zone .. (image below) .. a type of convergent plate boundary that stretches from northern Vancouver Island to northern California. It is a very long sloping fault that separates the Juan de Fuca and North America plates. New ocean floor is being created offshore of Washington and Oregon. As more material wells up along the ocean ridge, the ocean floor is pushed toward and beneath the continent. The Cascadia Subduction Zone is where the two plates meet. Tectonic processes active in the Cascadia subduction zone region include accretion, subduction, deep earthquakes, and active volcanism that has included such notable eruptions as Mazama (Crater Lake) several thousand years ago and Mount St. Helens in 1980. Major cities affected by a disturbance in this subduction zone would include Vancouver, Seattle, Portland, and Victoria.

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Subduction zone image ..



http://en.wikipedia.org/wiki/Cascadia_subduction_zone