by constructing them so that they sway back and fourth rather than just simply crumbling to the ground killing people. The San Andreas fault is formed by the Pacific plate sliding north and the North American plate running South. The two slide together caused the earthquake. The most recent earthquake in that area today, was in 1990 in San Francisco which measured around 8.3 on the richter scale but it wasn't a bad as the one in 1906....
