Does Semmes, AL need an earthquake retrofit?

Semmes carries Seismic Design Category B under USGS's ASCE 7-16 model. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Semmes ranks above 27% of the 4,875 cities in this dataset for seismic hazard - the 27th percentile.

Semmes by the numbers

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, Semmes ranks 89 for seismic hazard, the 17th percentile within the state. About 6,193 people live in Semmes, Alabama.

What a retrofit costs in Semmes

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.

Earthquake insurance for a Semmes home

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 Semmes address.

More on how this number was built

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