Excuse me for forgetting my notes on this one, I think it was an Earth sci pic of the day. In this case, this fence was straight when it was built, but since then shows the efforts of the Fault. And here is where the resident residents can give far better information than I can. All I remember is my Earth Science teacher, in 9th grade, explaining that California was not actually going to fall into the ocean, and that more likely eventually western LA was going to be next to eastern SF.
I now realize that was hyperbole, but in the above shot you can actually see how the shifting affected this land; one side of it shifted one way while the other shifted t'other, or maybe didn't shift at all.