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The large, fast-moving mudslide that buried much of Oso, Washington, in March 2014 was the deadliest landslide in U.S. history. Since then, it’s been revealed that this area has experienced major slides before, but it’s not known how long ago they occurred. Geologists analyzed woody debris buried in earlier slides and used radiocarbon dating to map the history of activity at the site.
The findings show that a massive nearby slide happened around 500 years ago, and not thousands of years ago as some had believed.Image credit: Alison Duvall/University of Washington
