Does Huntsville, AL need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Huntsville 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. Rank it against the rest of the country and Huntsville sits at the 73th percentile for seismic hazard among 4,875 US cities.

How Huntsville compares

The raw figures: peak ground acceleration 0.134g, short-period spectral response 0.261g, 1-second spectral response 0.116g. Among 107 Alabama cities in this dataset, Huntsville ranks 57 for seismic hazard, the 47th percentile within the state. About 230,402 people live in Huntsville, Alabama.

Retrofit economics for Huntsville

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 Huntsville address.

More on how this number was built

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