Choctaw's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Choctaw 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 Choctaw sits at the 62th percentile for seismic hazard among 4,875 US cities.

Choctaw by the numbers

The raw figures: peak ground acceleration 0.155g, short-period spectral response 0.266g, 1-second spectral response 0.078g. Among 75 Oklahoma cities in this dataset, Choctaw ranks 25 for seismic hazard, the 68th percentile within the state. About 12,358 people live in Choctaw, Oklahoma.

What a retrofit costs in Choctaw

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Oklahoma. 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 Choctaw address.

More on how this number was built

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