Others have touched on other parts of your post, but I feel the need to comment on this one. As a daughter of an Engineering Geologist (an “expert source") I have a healthy yet realistic fear of the San Andreas fault. Yes, there is a section of that fault in Southern California that has not “gone off” recently. Recently, that is, in geologic time. My dad says the San Andreas is “10 months pregnant” and really could cause an earthquake any day. Or it could cause an earthquake 100 years from now. Those two times aren’t that far apart in geologic time. I checked on his faultline map in his office when I was in college (I wanted to know how safe I was while at UCI), and IIRC (I’m not the expert so I could be totally wrong) Irvine is a decent distance from the part of the fault that is ready to let off energy. We’ll probably feel it, and if the earthquake is strong enough we could see some damage, but the IE and parts of LA county will feel it worse. I’m going to see my dad tomorrow, so I might check on that with him.