Guntersville's Seismic Design Category, explained

Guntersville carries Seismic Design Category C under USGS's ASCE 7-16 model. 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 Guntersville sits at the 74th percentile for seismic hazard among 4,875 US cities.

Guntersville by the numbers

The raw figures: peak ground acceleration 0.151g, short-period spectral response 0.275g, 1-second spectral response 0.107g. Among 107 Alabama cities in this dataset, Guntersville ranks 44 for seismic hazard, the 59th percentile within the state. About 9,242 people live in Guntersville, Alabama.

Bracing and bolting: the actual cost

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

More on how this number was built

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