Channahon, IL: what USGS's seismic model says

Channahon 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, Channahon ranks above 47% of the 4,875 cities in this dataset for seismic hazard - the 47th percentile.

How Channahon compares

The raw figures: peak ground acceleration 0.072g, short-period spectral response 0.141g, 1-second spectral response 0.07g. Among 330 Illinois cities in this dataset, Channahon ranks 82 for seismic hazard, the 75th percentile within the state. About 14,392 people live in Channahon, Illinois.

Bracing and bolting: the actual cost

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.

Earthquake insurance for a Channahon 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 Channahon address.

More on how this number was built

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