Covington's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Covington is Category D. 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 Covington sits at the 96th percentile for seismic hazard among 4,875 US cities.

Covington by the numbers

The raw figures: peak ground acceleration 0.727g, short-period spectral response 1.221g, 1-second spectral response 0.419g. Among 104 Tennessee cities in this dataset, Covington ranks 4 for seismic hazard, the 97th percentile within the state. About 8,575 people live in Covington, Tennessee.

What a retrofit costs in Covington

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 Covington 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 Covington address.

More on how this number was built

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