Park City's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Park City in Seismic Design 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 Park City sits at the 30th percentile for seismic hazard among 4,875 US cities.

Where Park City sits in Illinois

The raw figures: peak ground acceleration 0.05g, short-period spectral response 0.1g, 1-second spectral response 0.056g. Among 330 Illinois cities in this dataset, Park City ranks 315 for seismic hazard, the 5th percentile within the state. About 7,940 people live in Park City, Illinois.

What a retrofit costs in Park City

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

More on how this number was built

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