Does St. Augustine, FL need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, St. Augustine is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and St. Augustine sits at the 24th percentile for seismic hazard among 4,875 US cities.

How St. Augustine compares

The raw figures: peak ground acceleration 0.043g, short-period spectral response 0.089g, 1-second spectral response 0.047g. Among 228 Florida cities in this dataset, St. Augustine ranks 8 for seismic hazard, the 97th percentile within the state. About 16,033 people live in St. Augustine, Florida.

What a retrofit costs in St. Augustine

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Florida. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

What this means for insurance

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a St. Augustine address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced St. Augustine's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.