The Giant, Underestimated Earthquake Threat to North America

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    The enormous fault off ?the coast of the Pacific Northwest has been silent for three centuries. But after years of detective work, geologists have ?discovered that it can? unleash mayhem on ?an epic scale. Just over one year ago, a magnitude-9 earthquake hit the Tohoku region of northeastern Japan, triggering one of the most destructive tsunamis in a thousand years.

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