I am in San Francisco (37 degrees south, 18 degrees north), near the San Andreas fault line. The two sides move past each other horizontally. It is a strike-slip fault line (a transform boundary). Because of this fault line, a lake San Andreas Lake formed. The fault makes a good spot to collect the water, and smashes the rock underneath to form an impermeable layer so the water won’t seep through. Also because of this fault line, the Black Mountain formed. The fault line on the Black Mountain changes 9 degrees. It formed a mountain because both sides lift up as the crumple while it’s dragged around the corner. There was a recent earthquake in 1989. It was incredibly destructive and intense. There are very often earth tremors in this area because of the tectonic activity.
http://www.unionstreetinn.com/images/sanfrancisco3.jpg
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