Rocky Mount's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Rocky Mount 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 Rocky Mount sits at the 29th percentile for seismic hazard among 4,875 US cities.

Where Rocky Mount sits in North Carolina

The raw figures: peak ground acceleration 0.048g, short-period spectral response 0.102g, 1-second spectral response 0.049g. Among 147 North Carolina cities in this dataset, Rocky Mount ranks 136 for seismic hazard, the 8th percentile within the state. About 54,541 people live in Rocky Mount, North Carolina.

What a retrofit costs in Rocky Mount

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 Rocky Mount address.

More on how this number was built

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