Smyrna, TN: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Smyrna 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 Smyrna sits at the 79th percentile for seismic hazard among 4,875 US cities.

Where Smyrna sits in Tennessee

USGS's underlying values for Smyrna: 0.125g peak ground acceleration, 0.256g at short period, 0.129g at 1 second. Within Tennessee alone, Smyrna ranks 59 of 104 cities by seismic hazard - the 44th percentile in-state. Smyrna has a population of about 60,302.

What a retrofit costs in Smyrna

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.

Earthquake insurance for a Smyrna home

A Smyrna 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 Smyrna's figures come from

Smyrna'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 Smyrna.