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This USGS website discusses evidence that an earthquake of magnitude 9 struck the northwestern United State and southwestern Canada in 1700. Visitors can learn how scientists determined this earthquake from Japanese writings of a tsunami occurrence on the Pacific coast of Japan. The site addresses the destruction that could occur if this magnitude earthquake again hit the region. To obtain a feel for the power of the earthquake and the tsunami created by it, visitors can view the animation depicting hourly images of the simulated tsunami progressing across the Pacific Ocean for a day.
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