Mount Holly, NC: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Mount Holly 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 Mount Holly sits at the 56th percentile for seismic hazard among 4,875 US cities.

How Mount Holly compares

The raw figures: peak ground acceleration 0.101g, short-period spectral response 0.198g, 1-second spectral response 0.081g. Among 147 North Carolina cities in this dataset, Mount Holly ranks 47 for seismic hazard, the 68th percentile within the state. About 18,723 people live in Mount Holly, North Carolina.

Retrofit economics for Mount Holly

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.

Earthquake insurance for a Mount Holly 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 Mount Holly address.

More on how this number was built

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