Does Hendersonville, NC need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Hendersonville in Seismic Design Category C: Moderate seismic hazard. Code adds irregular-building restrictions and requires bracing of some nonstructural components (e.g. tall shelving, water heaters) in addition to structural detailing. Rank it against the rest of the country and Hendersonville sits at the 76th percentile for seismic hazard among 4,875 US cities.

How Hendersonville compares

The raw figures: peak ground acceleration 0.174g, short-period spectral response 0.3g, 1-second spectral response 0.094g. Among 147 North Carolina cities in this dataset, Hendersonville ranks 5 for seismic hazard, the 97th percentile within the state. About 15,656 people live in Hendersonville, 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.

Earthquake insurance for a Hendersonville 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 Hendersonville address.

More on how this number was built

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