Does Garden City, GA need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Garden City is 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. Rank it against the rest of the country and Garden City sits at the 75th percentile for seismic hazard among 4,875 US cities.

How Garden City compares

The raw figures: peak ground acceleration 0.163g, short-period spectral response 0.3g, 1-second spectral response 0.111g. Among 148 Georgia cities in this dataset, Garden City ranks 12 for seismic hazard, the 93th percentile within the state. About 10,536 people live in Garden City, Georgia.

What a retrofit costs in Garden City

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Georgia. 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 Garden City address.

More on how this number was built

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