The Seattle Times

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Mark Mulligan / The Herald, Pool
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Thursday, March 27, 2014

Laser maps reveal slide risk with startling clarity, but few citizens know they exist

A searcher walks amid a massive pile of debris at the scene of the deadly mudslide Thursday near Oso, Snohomish County. The landslide risks near Oso were well documented, even before the advent of the aerial scanning technique called lidar, yet construction was still allowed in harm’s way.