Mount Carmel's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Mount Carmel in Seismic Design Category D: High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. Rank it against the rest of the country and Mount Carmel sits at the 87th percentile for seismic hazard among 4,875 US cities.

Where Mount Carmel sits in Illinois

The raw figures: peak ground acceleration 0.38g, short-period spectral response 0.612g, 1-second spectral response 0.185g. Among 330 Illinois cities in this dataset, Mount Carmel ranks 9 for seismic hazard, the 98th percentile within the state. About 6,771 people live in Mount Carmel, 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 Mount Carmel 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 Mount Carmel address.

More on how this number was built

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