How Did The Snohomish County Landslide Happen? - NBC Right Now/KNDO/KNDU Tri-Cities, Yakima, WA |

How Did The Snohomish County Landslide Happen?

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The images of the Snohomish County landslide area are hard to fathom and many are left wondering how did this all happen? NBC Right Now did some digging. The images of the Snohomish County landslide area are hard to fathom and many are left wondering how did this all happen? NBC Right Now did some digging.

NBCRightNow.com - The images of the Snohomish County landslide area are hard to fathom and many are left wondering how did this all happen? NBC Right Now did some digging.

Now that those seismologists and experts have assessed the area and their data we now know there were multiple factors that added up. The Stillaguamish River was actually above average height in days leading up to the landslide. The day of the landslide we see that height go down as water poured out.

A small 1.1 magnitude earthquake on the March 10th may have shifted things just above the hill according to John Pennington from the Department of Emergency Management. It was on Saturday that the build up on top of that hill just collapsed in on itself. As it came downward it created a sliding effect forcing all of that earth and the debris shooting out and down towards those homes.

All of this information is what we're getting from the U.S. Geological Survey, analysts on the scene and even researchers from the University of Washington. Their studies are showing the landslide actually hit in two parts. Each slide lasted about 2 minutes each with one after the other just minutes apart. It is important to note that geologists have known the area could be prone to landslides for years.

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