Madisonville's Seismic Design Category, explained

Madisonville carries Seismic Design Category D under USGS's ASCE 7-16 model. High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. Rank it against the rest of the country and Madisonville sits at the 90th percentile for seismic hazard among 4,875 US cities.

How Madisonville compares

The raw figures: peak ground acceleration 0.5g, short-period spectral response 0.735g, 1-second spectral response 0.148g. Among 104 Tennessee cities in this dataset, Madisonville ranks 17 for seismic hazard, the 84th percentile within the state. About 5,395 people live in Madisonville, 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.

Insuring against this, not just retrofitting

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 Madisonville address.

More on how this number was built

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