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TITLE: Juan de Fuca Ridge


[Photo: Juan de Fuca Ridge]

Just 400 km (250 mi) off the coast of Oregon and Washington, the Juan de Fuca Ridge is spreading at a rate of 6 cm (2.4 in) per year more than twice as fast as the Mid-Atlantic Ridge. At the ridge crest, two plates slowly move apart. The eastward-moving plate descends beneath the North American Plate in the Pacific Northwest, triggering volcanic eruptions in the Cascade Range and occasional large earthquakes.

 


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