St. Francis, WI: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places St. Francis in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts St. Francis in the 19th percentile nationally for seismic hazard - higher than 19% of the 4,875 US cities USGS was checked against here.

St. Francis by the numbers

USGS's underlying values for St. Francis: 0.037g peak ground acceleration, 0.077g at short period, 0.049g at 1 second. Within Wisconsin alone, St. Francis ranks 46 of 157 cities by seismic hazard - the 71th percentile in-state. St. Francis has a population of about 8,951.

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 Wisconsin 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 Wisconsin.

Earthquake insurance for a St. Francis home

A St. Francis 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 St. Francis's figures come from

St. Francis's Category B 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 B does and doesn't tell you about St. Francis.