Does Hartsville/Trousdale County, TN need an earthquake retrofit?

Hartsville/Trousdale County carries Seismic Design Category C under USGS's ASCE 7-16 model. 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 Hartsville/Trousdale County sits at the 71th percentile for seismic hazard among 4,875 US cities.

Hartsville/Trousdale County by the numbers

The raw figures: peak ground acceleration 0.108g, short-period spectral response 0.225g, 1-second spectral response 0.12g. Among 104 Tennessee cities in this dataset, Hartsville/Trousdale County ranks 103 for seismic hazard, the 1th percentile within the state. About 12,159 people live in Hartsville/Trousdale County, Tennessee.

Bracing and bolting: the actual cost

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 Hartsville/Trousdale County 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 Hartsville/Trousdale County address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Hartsville/Trousdale County'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.