Does Corbin, KY need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Corbin is 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. That puts Corbin in the 76th percentile nationally for seismic hazard - higher than 76% of the 4,875 US cities USGS was checked against here.

Corbin by the numbers

The raw figures: peak ground acceleration 0.169g, short-period spectral response 0.291g, 1-second spectral response 0.095g. Among 79 Kentucky cities in this dataset, Corbin ranks 16 for seismic hazard, the 81th percentile within the state. About 7,891 people live in Corbin, Kentucky.

Retrofit economics for Corbin

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Kentucky. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Earthquake insurance for a Corbin 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 Corbin address.

More on how this number was built

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