Five decades after the nation’s most powerful earthquake hit Alaska, scientists have pinpointed the underwater slide that triggered some of the deadliest tsunami waves produced by the shaking.

Using modern technology to map the floor of Prince William Sound, scientists from the U.S. Geological Survey and other organizations have found the landslide behind the tsunamis that killed about a third of the people in the Alutiiq village of Chenega, the service said on Monday.t

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