This is a great video showing the application of ground freezing to deep excavations in unstable soil and high groundwater table. It’s also a nice overview of the reason the Hetch Hetchy project was undertaken, […]
These geologic maps just released from the California Geologic Survey mark the 150th anniversary of the CGS. They can be viewed online in a very easy to use Google Maps interface. The previous Geologic Map […]
This is not the first time I’ve posted links to blog posts from the Ontario-geofish blog by Harold A. Some times I blatantly rip him off, but hopefully he doesn’t mind since I try to credit him whenever I post about an article he found. I guess he has more time for surfing since he’s retired! 🙂 Here are a couple of his recent posts that I found interesting. (Image by NASA)
As a follow up to a previous post, the San Andreas Fault Observatory at Depth (SAFOD) team has announced that they have successfully completed their drilling and obtained cores of the San Andreas Fault at depths in excess of 2 miles below the surface. The zone of interest is approximately 135-ft in length. The core size is 4-in diameter. They have cemented in a 7-in casing and the next phase of the project will be to perforate the casing within the fault and install monitoring equipment consisting of seismometers, accelerometers, tiltmeters and a fluid pressure transducer. Read on for more info and links. (Image credit: EarthScope / NSF)
There is currently a major project going on to drill into the San Andreas Fault to better understand the various mechanisms of the fault system. The project is organized and run by SAFOD, the San […]
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