If there is a major quake on the Hayward , San Andreas or Calavaras fault in the SF area, there will be massive, massive damage. The Calavaras fault runs only about a mile from my place, along the base of the hills I can see from my window. There was a 5.6 several months ago that just knocked stuff off shelves. All the aftershocks were south of that quake, meaning the section by me is locked and building up stress.
The Hayward fault, which is predicted to be the most likely to go next runs directly through the six east bay cities with populations ofover a million total.The city of Fremont built their city hall directly on a branch of it in the 70s. They ended up abandoning it a few years later when they found out about the branch and tore it down in 2004. The city of Hayward had put their city hall right on the main fault many years ago. They recently built a new one several blocks away.
The fault goes directly through Memorial Stadium where the UC Berkley Golden Bears play. It goes from goalpost to goalpost. I've seen pictures of the end zone seats where the fault has crept several inches since the stadium was built many years ago.
This week I have to work at a site that may be directly on the San Andreas. If it isn't through the property, it is likely within 500-1000 feet of it. I will be looking for offset curbs etc. when I am there.