One of the interesting things is our local geography. Without getting specific, I live on what is locally known as the Peninsula. For those not familiar with the area, see this tinyurl of Google maps:
http://tinyurl.com/29fluhwhich shows the peninsula. I live near the middle of the peninsula between San Francisco and San Jose on the Bay side (as opposed to the Coast side). If you look at the map, you'll see lots of roads on the Bay side and white on the Coast side - mountains on the Coast side - that's where the Pacific Plate and the North Amercian Plate rub up against each other.
The San Andreas Fault is on the coast side of the peninsula (you can see a reservoir on the map where 92 crosses 280 - that's the fault), and the Hayward Fault is across the bay running through Hayward, Oakland, and neighboring towns. Depending on where the earthquake hits, there may be no two-day hike that leads to safe areas and stable ground. Again without getting specific, age and health play a relationship to what a two-day hike is.
I realize I'm throwing up hitherto unknown objections to a good idea, and I'm not trying to shoot it down - I hadn't considered hiking out, as I don't think it's possible. However, I'll reconsider. I do know that a two-day hike for you is not doable for us. This means a bigger load for more days.
A storage locker outside the area is also an idea, but I'd have to make a guess on where "outside the area" would be.
Maybe I've been too locked in on surviving in place, and I need to consider some way to get to another area. I'm drawing a blank on it inow, but I'll keep at it. Age and health play a role in bailing out. If we try to hike out and can't, where will we be stuck? Are we better off staying home? Questions that have no answers, only judgments and consequences.