Does Butner, NC need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Butner in Seismic Design 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 Butner sits at the 33th percentile for seismic hazard among 4,875 US cities.

Butner by the numbers

The raw figures: peak ground acceleration 0.055g, short-period spectral response 0.116g, 1-second spectral response 0.058g. Among 147 North Carolina cities in this dataset, Butner ranks 122 for seismic hazard, the 17th percentile within the state. About 8,134 people live in Butner, North Carolina.

Bracing and bolting: the actual cost

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

More on how this number was built

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