Winfield's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Winfield is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Winfield sits at the 34th percentile for seismic hazard among 4,875 US cities.

Winfield by the numbers

The raw figures: peak ground acceleration 0.056g, short-period spectral response 0.115g, 1-second spectral response 0.067g. Among 126 Indiana cities in this dataset, Winfield ranks 113 for seismic hazard, the 10th percentile within the state. About 8,557 people live in Winfield, Indiana.

Bracing and bolting: the actual cost

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

More on how this number was built

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