St. Joseph, MN: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, St. Joseph is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Rank it against the rest of the country and St. Joseph sits at the 8th percentile for seismic hazard among 4,875 US cities.

Where St. Joseph sits in Minnesota

USGS's underlying values for St. Joseph: 0.026g peak ground acceleration, 0.055g at short period, 0.019g at 1 second. Within Minnesota alone, St. Joseph ranks 19 of 155 cities by seismic hazard - the 88th percentile in-state. St. Joseph has a population of about 6,992.

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 Minnesota 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 Minnesota.

What this means for insurance

A St. Joseph 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. Joseph's figures come from

St. Joseph's Category A 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 A does and doesn't tell you about St. Joseph.