Does Oak Park, MI need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Oak Park is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Oak Park sits at the 29th percentile for seismic hazard among 4,875 US cities.

How Oak Park compares

USGS's underlying values for Oak Park: 0.048g peak ground acceleration, 0.097g at short period, 0.045g at 1 second. Within Michigan alone, Oak Park ranks 61 of 153 cities by seismic hazard - the 61th percentile in-state. Oak Park has a population of about 29,402.

Retrofit economics for Oak Park

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 Michigan 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 Michigan.

Insuring against this, not just retrofitting

A Oak Park 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 Oak Park's figures come from

Oak Park'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 Oak Park.