Geologist: 'This is one of the biggest landslides I've seen'

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by KING 5 News

KING5.com

Posted on March 24, 2014 at 3:57 PM

Updated Wednesday, Mar 26 at 9:48 AM

DARRINGTON, Wash. -- Washington state geologist Dave Norman gave a news briefing Monday afternoon on what happened geologically in the mudslide in Oso that has left at least eight dead.

"This is one of the biggest landslides I've seen," said Norman.

In the news conference, Norman explained what has happened historically in the area, what happened over the weekend and what geologists have observed is ongoing at the location.

Some facts shared by Norman include the following:

  • The mudslide is 1,500 feet long, 600 feet vertical, 4,400 feet wide.
  • The debris field is 30-40 feet deep and impacting the north fork of the Stillaguamish River, where pressure is being relieved.
  • The area is made up of glacial sediments and historically has had many landslides, the most recent in 2006 and 1969.

Watch KING Glenn Farley's full report on the geological report coming up on KING 5 News at 5pm.

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