Dating university washington
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Lidar studies conducted before and after the 2014 Oso slide revealed 25 landslides up and down the Stillaguamish River Valley.
The ice sheet dammed many of the rivers flowing west out of the Cascade Mountains, building up massive deposits of fine clay and silt particles more than 200 meters thick in what is now the Stillaguamish River Valley.
“This is a setup for landslides: a lot of inherently unstable and impermeable material in a climate that gets a lot of rain,” says Sean La Husen, a geomorphologist at the University of Washington and lead author of the new study published in Geology.
On March 22, 2014, after a period of heavy rain, a hillside near the town of Oso, Wash., collapsed, sending 7.6 million cubic meters of mud and debris across the North Fork of the Stillaguamish River, destroying a rural neighborhood and killing 43 people.
The slide took Oso residents by surprise, but scientists say the event was not altogether unexpected, as evidence for dozens of past landslides can be found throughout the Stillaguamish River Valley.
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