DISCLAIMER: I have NO Earthquake experience!

I have noted one area that prople don't usually think about in both Tornado and Earthquake areas. The easiest way to provide the 4 Survival needs (shelter, water, food, heat) is to acquire a camper that is kept stocked to go. What few think about is the proximity that such a resource(s) are kept in relation to one's home. Tornado's, like Earthquakes, occur along mostly known paths or fault lines. Yes tornado's do cover new paths occasionly just as unknown fault lines make themselves known. Store your supplies in a type of structure away from your home, in case it collapsed. For eq country, use a lightly built structure that if it collapsed, would not destroy your supplies and which said debris could be cleared from your supplies to make them accessible.

The next problem is figuring out where is available to store supplies that is close enough to access but far enough away to escape debris from your home. This is a difficult problem in Tornado country and MAY be an impossible goal to achieve in EQ country.