West Frankfort, IL: what USGS's seismic model says

West Frankfort carries Seismic Design Category D under USGS's ASCE 7-16 model. 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. Nationally, West Frankfort ranks above 87% of the 4,875 cities in this dataset for seismic hazard - the 87th percentile.

West Frankfort by the numbers

USGS's underlying values for West Frankfort: 0.391g peak ground acceleration, 0.673g at short period, 0.235g at 1 second. Within Illinois alone, West Frankfort ranks 8 of 330 cities by seismic hazard - the 98th percentile in-state. West Frankfort has a population of about 7,131.

Bracing and bolting: the actual cost

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Illinois specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Illinois.

Earthquake insurance for a West Frankfort home

A West Frankfort homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where West Frankfort's figures come from

West Frankfort's Category D and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category D does and doesn't tell you about West Frankfort.