A Large Landslide Occurred at Mount Saint Helens; Major Road Closed

A major landslide just occurred to the north of Mount Saint Helens, occurring on the Sunday before the 43rd anniversary of its destructive volcanic eruption. As a result of this landslide, Spirit Lake Highway was blocked with a bridge destroyed, resulting in a closure of Johnson Observatory. This video discusses why this landslide occurred and how it relates to both hydrothermal alteration and the weather. Thumbnail Photo Credit: This work Landslide8, is a derivative of a photo (resized, cropped, text overlay, GeologyHub made graphics overlay (the GeologyHub logo and the image border)) from Landslide, by: Sheri Terris, crestedcrazy, 2007, Posted on Flickr, Flickr account link: Photo link: CC BY 2. 0. Landslide8 is used licensed under CC BY 2. 0 by Note: This video s thumbnail image does not portray the landslide at Mount Saint Hel