When we were looking at real estate in the east we were well informed of the “flood” areas and assured it was no problem because the mandatory federally backed insurance was cheap – and that was true. Of course it encouraged people to go ahead and buy in flood zones (usually a little less expensive than non-flood areas).
So why doesn’t the federal gov subsidize earthquake insurance? It certainly is a less predictable natural disaster than floods are. Some of the flood areas in the east flood regularly.
In San Francisco the only people I knew who had earthquake insurance owned condominiums because it is required in multi-dwellings. That is why HOA fees are so expensive in San Francisco.