Del City's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Del City in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Del City in the 65th percentile nationally for seismic hazard - higher than 65% of the 4,875 US cities USGS was checked against here.

How Del City compares

The raw figures: peak ground acceleration 0.182g, short-period spectral response 0.304g, 1-second spectral response 0.081g. Among 75 Oklahoma cities in this dataset, Del City ranks 19 for seismic hazard, the 76th percentile within the state. About 21,272 people live in Del City, Oklahoma.

What a retrofit costs in Del City

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.

Insuring against this, not just retrofitting

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 Del City address.

More on how this number was built

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