EVERETT, Wash. (AP) - A study of the Oso landslide in Washington state that killed 43 people in March says the amount of water that saturated a hillside made it especially destructive when it gave way.
The soil lost its coherence and flowed like a liquid in a process called liquefaction.
The Daily Herald reports (https://bit.ly/1CfbPnn ) the study was published last week by U. S. Geological Survey hydrologist Richard Iverson who is based at the Cascades Volcano Observatory in Vancouver.
The slide occurred on a dry day during one of the wettest winters on record in the area.
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Information from: The Daily Herald, https://www.heraldnet.com
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