Monticello, IL: what USGS's seismic model says

Monticello carries Seismic Design Category C under USGS's ASCE 7-16 model. 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 Monticello sits at the 68th percentile for seismic hazard among 4,875 US cities.

Where Monticello sits in Illinois

The raw figures: peak ground acceleration 0.086g, short-period spectral response 0.178g, 1-second spectral response 0.094g. Among 330 Illinois cities in this dataset, Monticello ranks 58 for seismic hazard, the 83th percentile within the state. About 6,010 people live in Monticello, Illinois.

Retrofit economics for Monticello

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 Monticello 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 Monticello address.

More on how this number was built

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