Edmond's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Edmond is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Edmond ranks above 62% of the 4,875 cities in this dataset for seismic hazard - the 62th percentile.

How Edmond compares

The raw figures: peak ground acceleration 0.15g, short-period spectral response 0.26g, 1-second spectral response 0.076g. Among 75 Oklahoma cities in this dataset, Edmond ranks 26 for seismic hazard, the 66th percentile within the state. About 99,040 people live in Edmond, Oklahoma.

Retrofit economics for Edmond

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 Edmond address.

More on how this number was built

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