Does Tulsa, OK need an earthquake retrofit?

Tulsa carries Seismic Design Category B under USGS's ASCE 7-16 model. 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 Tulsa sits at the 39th percentile for seismic hazard among 4,875 US cities.

Where Tulsa sits in Oklahoma

The raw figures: peak ground acceleration 0.062g, short-period spectral response 0.13g, 1-second spectral response 0.073g. Among 75 Oklahoma cities in this dataset, Tulsa ranks 63 for seismic hazard, the 16th percentile within the state. About 415,154 people live in Tulsa, Oklahoma.

Bracing and bolting: the actual cost

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.

Earthquake insurance for a Tulsa home

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 Tulsa address.

More on how this number was built

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