The Martis Creek Dam is just outside of the town of Truckee California with a population of 16,000 people, but it is also upstream about 35 miles from Reno, Nevada the gambling town with a population of around 220,000. A newly discovered fault that crosses under the dam could potentially produce a 6.9 magnitude earthquake and potentially cause a failure of the structure. The fault was discovered from aerial LIDAR imagery analysis and confirmed and dated with paleoseismic trenching work done along various glacial terraces. [Source: Mail Online via AGC SmartBrief. Image: USACE via Mail Online]
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Devil’s Slide Breakthrough Video and Links
The “breakthrough” media event for CALTRANS’ Devil’s Slide Tunnel project was this past Friday. A large crowd of politicians, news crews and locals were on hand as a road-header broke through a shotcrete face in a ceremony to mark the completion of the excavation portion of the first of two tunnels. It will still be over a year until the tunnels are opened to traffic. The second tunnel is expected to breakthrough as early as this week. (Photo by SFGate.com)
Caltrans tunnel punch-through from Barry Parr on Vimeo.
The Video came from the Coastsider, the page also has comments from the videographer, Barry Parr, which offer a good perspective on the event.
Click on through for more links etc.