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    Northwest Geology Field Trips, by Dave Tucker, is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 United States License. You can use what you find here, repost it with attribution to the author, "remix" it for your own purposes, but may not use it with the intent of making money off of it.

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Stillaguamish is flowing again.

Dan McShane has been keeping an eye on the river gage on the Stilliguamish below the landslide. His latest post shows that the river is no longer backing up behind the landslide dam. Dan includes a graph from the river gage. I’ve copied his screen capture below- click to enlarge. You can see that discharge [= flow measured in cubic feet per second] dropped instantaneously just after noon on 3/22, from 2000 cfs to 900, and continued to decline down to 700 cfs until Sunday at around 3 PM.  Then the level of the impounded river had risen enough to begin overtopping the low point on the slide surface and began to flow downstream again. The last data point on the graph is from Monday at about 6 PM, and flow seems to have stabilized. You can track the discharge yourself at the gage website.

Stilliguamish gage data. Click to enlarge.

Stilliguamish gage data. Click to enlarge.

Stillaguamish Landslide- Geologic Perspectives

Interpretation of landslide scarp on LiDAR image, by Dan McShane.

Interpretation of landslide scarp on LiDAR image, by Dan McShane. Click to enlarge.

Dan McShane has written some geologic perspectives about Saturday’s landslide into the Stillaguamish River. Dan is a consulting geologist based in Bellingham and author of ‘Washington Landscapes’ blog, and has some great insights into the geology and history of the slide area. Rather than trying to rewrite his excellent reports, I’ll just provide the links. It is not the first landslide in this location. In my view, it  is a tragedy that people are permitted to live in this location.

 

Dan’s Initial report:

http://washingtonlandscape.blogspot.com/2014/03/arm-waving-notes-on-stilliguamish.html

Geologic background:

http://washingtonlandscape.blogspot.com/2014/03/geology-of-silliguamish-blocking-slide.html

LiDAR images and slide history.

http://washingtonlandscape.blogspot.com/2014/03/aerial-history-and-lidar-of.html

Stay tuned for more posts from Dan. Consider subscribing to his blog.

 

Debris flow video- MUST SEE

If you like watching video of dynamic geologic events, watch this one!

It shows a debris flow in a channel pulsing through the Austrian mountain town of Virgen following heavy rain in late August, 2012, and is incredible. Watch for large floating boulders, carried along on the dense flow of sediment. This is one of the top debris flow videos ever made, on a par with the one made by Kevin Scott of the USGS when he was working in the Jangjia Ravine in China.

The Austrian video comes our way from the Landslide Blog, always worth checking out.