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Science team: Oso mudslide delivered a one-two punch

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The Oso landslide likely unfolded in two phases, with the first one doing most of the damage to life and property, says a report released Tuesday.

The lower portion of the slope, including a jumble of soil and rock from a previous slide in 2006, collapsed first, according to the analysis from a team of scientists and engineers who examined the site in May.

As the saturated soil slid and gained momentum, it became more fluid, plowing across the Stillaguamish…

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