Calhoun's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Calhoun in Seismic Design Category C: 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. That puts Calhoun in the 79th percentile nationally for seismic hazard - higher than 79% of the 4,875 US cities USGS was checked against here.

Calhoun by the numbers

USGS's underlying values for Calhoun: 0.274g peak ground acceleration, 0.427g at short period, 0.111g at 1 second. Within Georgia alone, Calhoun ranks 4 of 148 cities by seismic hazard - the 98th percentile in-state. Calhoun has a population of about 19,592.

Retrofit economics for Calhoun

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 Georgia 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 Georgia.

Earthquake insurance for a Calhoun home

A Calhoun 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 Calhoun's figures come from

Calhoun's Category C 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 C does and doesn't tell you about Calhoun.