Florida doesn't really have earthquakes but it would be interesting. I suspect our soil (sand) would liquefy but the code compliant houses are fairly well strapped with steel, from the foundation to the roof. I suspect that you might just find your house had moved over to the neighbors lot.
US building code builds seismic resistance into it. Every structure in the US has at least *some* earthquake resistance, including Florida. The required resistance is proportional to the threat and potential severity of a quake; even in places you don't normally think of as seismically active. For the most part, it's easy to design to and a negligible cost, and not much of an issue.
It's interesting, also, how similar wind resistance building structural requirements are to seismic structural requirements; the shear walls, hurricane straps, lateral reinforcement, etc, are practically identical. I daresay homes in Florida would be some of the most earthquake resistant in the country.
