Does Marianna, FL need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Marianna is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Marianna ranks above 18% of the 4,875 cities in this dataset for seismic hazard - the 18th percentile.

How Marianna compares

The raw figures: peak ground acceleration 0.035g, short-period spectral response 0.076g, 1-second spectral response 0.054g. Among 228 Florida cities in this dataset, Marianna ranks 28 for seismic hazard, the 88th percentile within the state. About 7,975 people live in Marianna, Florida.

Bracing and bolting: the actual cost

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 Marianna address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Marianna'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.