Bristol's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Bristol 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 Bristol sits at the 75th percentile for seismic hazard among 4,875 US cities.

How Bristol compares

The raw figures: peak ground acceleration 0.164g, short-period spectral response 0.281g, 1-second spectral response 0.087g. Among 104 Tennessee cities in this dataset, Bristol ranks 91 for seismic hazard, the 13th percentile within the state. About 27,867 people live in Bristol, Tennessee.

Retrofit economics for Bristol

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

Earthquake insurance for a Bristol 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 Bristol address.

More on how this number was built

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