My first thought was GTHOD...get the hell outta dodge. But I know it isn't so simple...I lived thru the Japan quake last year. Really, you need to be prepared at all times to shelter in place, or GTHOD. Within an hour or so of the quake, the local supermarkets were barren...nothing at all. I was first in line the next morning at the gas station and they still had gas because they had shut down immediately after the quake for safety's sake. An hour later the line to get gas was about a quarter mile long. The banks' systems were screwed up, so you could not get cash at the ATM. As those of you who have lived thru disasters know, literally everything shuts down. The first time we saw much of anything in the stores was about 3-4 days later. We did not lose electricity but we did lose phone service. Cellular service was also lost, but 3G data worked sporadically so I could email my wife but could not text or call. So, in a nutshell
-keep non-perishable food and water on hand...don't wait for the warning
-keep a few hundred in cash on hand, small bills only...don't expect change from gougers
-keep some means of keeping warm on hand, kerosene stoves come to mind, but you have to be careful with them. They are relatively safe, and are what we used in Japan for a long time
-have a solar/crank charger for your cell phone if you don't have a genny
-if you have a fireplace or woodstove, make sure you have wood too.
-be prepared all the time, not just when there is a warning
-have a 72 hour kit packed and ready to go anytime (food, water, clothes, copies of your most important docs, such as passport, other ID, flashlight, water treatment pills, cash)
-when the call goes out to GTHOD, pick up your 72 hour kit on the way out the door, and leave everything else (many of the people lost in the tsunami had actually gone back for one or another "important" items, and lost their lives in the process).
hope this is useful
R