I worked for the Red Cross as a shelter manager after Hurricane Andrew.
Shall never forget my day off, driving down to see Kermit Weeks at the ruins of his air museum. Drove for miles and miles and never saw an intact building.
After a major earthquake, at least in this country (worked many here, in Mexico and elsewhere), the damage may be widespread, but rarely total.
The last time the US was hit with a catastrophic earthquake was in the early eighteenth century. That was the New Madrid quake. It devestated areas on either side of the Mississippi from the Gulf to the Canadian border. While it even re-routed the river, the population was so small then there were few casualties.
Today that would cause damage in the hundreds of billions of $$ and thousands of casualties.
Had a friend back in the sixties who moved to Utah because "California was going to fall into the ocean". She oved back after being trapped in her cabin for two days when it collapsed....(drum roll) in one of the strongest earthquakes Utah ever had.
Then there are fires..........:-(
Tom