Update Commentary on the OSO Slide: Scott Burns

Scott Burns, emeritus at Portland State and a student of Peter Birkeland, wrote an excellent article about the OSO Slide. I made a few animations and armchair interpretations about this slide shortly after it happened (here).

Scott discusses the geologic history and how heavy rainfall was a likely co-conspirator that led to the triggering of this horribly destructive landslide. Here is the article.

This is a general location map:

Here is an animation from David George and Dick Iverson at the USGS:

As a reminder, here is a map showing the historic landslides in the area:

Here is the geologic mapping done at the 1:24,000 scale published by the Washington State Department of Natural Resources. Click on the map below to see the entire map. Below is a clip of the map in the region of the OSO Landslide of 2014. Click here to see this inset map in a new browser window. Note the location of a dotted strike slip fault in the region of the OSO slide.

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