Maryville, IL: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Maryville 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. That puts Maryville in the 84th percentile nationally for seismic hazard - higher than 84% of the 4,875 US cities USGS was checked against here.

Maryville by the numbers

USGS's underlying values for Maryville: 0.257g peak ground acceleration, 0.447g at short period, 0.158g at 1 second. Within Illinois alone, Maryville ranks 31 of 330 cities by seismic hazard - the 91th percentile in-state. Maryville has a population of about 8,352.

What a retrofit costs in Maryville

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.

Insuring against this, not just retrofitting

A Maryville 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 Maryville's figures come from

Maryville'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 Maryville.