|DeRose Winery drainage culvert in 1961 (courtesy of USGS field guide)|
|DeRose Winery drainage culvert yesterday, courtesy of me...|
The drainage culvert is a famous locality that is visited by hundreds of geology students every year. It is located at a winery about eight miles south of the town of Hollister in the central California Coast Ranges. That's what we were up to yesterday, exploring the San Andreas and Calaveras fault zones with my geology students.
As I recall the story, the winery was first constructed in the 1800's, but for some inexplicable reason, it fell apart. It was rebuilt and then fell apart again, and then was constructed once again at the present location in 1948. When the building started showing signs of stress again, an investigation in the late 1950s led to the conclusion that it had been built on the San Andreas fault, and that the fault was moving around 0.5 inches per year.
It's easier than you might think to see the San Andreas and Calaveras faults for yourself. There are several good road guides in books and online. An excellent one by the U.S. Geological Survey can be accessed here: http://pubs.usgs.gov/bul/b2188/b2188ch6.pdf
There were some pretty sights at Pinnacles National Monument. More in the next post!