Does Satsuma, AL need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Satsuma is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Satsuma in the 27th percentile nationally for seismic hazard - higher than 27% of the 4,875 US cities USGS was checked against here.

How Satsuma compares

The raw figures: peak ground acceleration 0.047g, short-period spectral response 0.098g, 1-second spectral response 0.062g. Among 107 Alabama cities in this dataset, Satsuma ranks 88 for seismic hazard, the 18th percentile within the state. About 6,874 people live in Satsuma, Alabama.

What a retrofit costs in Satsuma

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.

What this means for insurance

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 Satsuma address.

More on how this number was built

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