Gallatin's Seismic Design Category, explained

Gallatin 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 Gallatin sits at the 79th percentile for seismic hazard among 4,875 US cities.

Gallatin by the numbers

USGS's underlying values for Gallatin: 0.12g peak ground acceleration, 0.249g at short period, 0.129g at 1 second. Within Tennessee alone, Gallatin ranks 62 of 104 cities by seismic hazard - the 41th percentile in-state. Gallatin has a population of about 52,489.

What a retrofit costs in Gallatin

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Tennessee specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Tennessee.

Insuring against this, not just retrofitting

A Gallatin homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Gallatin's figures come from

Gallatin's Category D and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category D does and doesn't tell you about Gallatin.