The Pacific coastline from northern California to Canada's Vancouver Island faces the threat of a major earthquake along the Cascadia subduction zone, according to a study by U.S. and Canadian researchers. Earthquakes tend to hit the region every 500 to 1,000 years, said Audrey Dallimore, author of the study. "[It] may happen within our lifetimes and will certainly happen at some time over the life of our communities and our infrastructures," Dallimore said. The last major earthquake in the region occurred 313 years ago.

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