This is a nice overview of a slow-moving landslide in a Salt Lake City, Utah neighborhood where you can go on Google Earth and do your own aerial photo analysis using Google’s historic aerial imagery. Dr. Dave also points to some available resources from the Utah Geologic Survey that show the rate of movement accelerating with around 2-ft of movement over the past 6-months or so. [Source: The Landslide Blog. Image: Utah GS via Landslide Blog]
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Devil’s Slide Tunnel Update and First Attempts to Tame the Landslide
The Devil’s Slide Tunnel project is on schedule and on budget according to a news story at ABC7News.com from earlier in June. The video (shown after the break) has a few nice shots showing rock bolting, soil nailing at the portals, and the geologic mapping and laser scanning that happens at the tunnel face.
I also came across a very neat article about how the Ocean Shore Railroad Company was the first to try to cut into the slope along what is now PCH 1 at the Devil’s Slide back in the early 1900s. They were trying to connect the then rural farming community of Half-Moon Bay with San Francisco. The railroad fought the reoccurring landslide and serious rockfalls. Ocean Shore Railroad went bankrupt in 1922 and pulled up its rails, making room for the current highway. (Photo at left from halfmoonbaymemories.com)