Sunday, February 20, 2011

A Walk by Crystal Springs

After four days of non-stop rain (the cold kind that bites into your skin), the sun finally came out today. So, Chelle and I ventured out and took a hike along the trail that runs by Crystal Springs Reservoir. As you can see, the sun then retreated and more storms threatened, but thankfully they blew on by.

The Reservoir is interesting because basically it was created by a dam on San Andreas Lake, a sag pond over the San Andreas Fault. The reservoir itself is fed by an aqueduct shuttling water from Hetch Hetchy in the Sierra Nevada (basically a flooded Yosemite Valley Junior). If you look at photos of San Andreas Lake and Crystal Springs Reservoir from the air, you can even see the fault line--a classic "strike-slip" fault where the two plates strike and slip past each other. The San Andreas Fault, of course, was the cause of the great 1906 San Francisco Earthquake and the 1989 Loma Prieta quake.

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