Does Center Line, MI need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Center Line in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Center Line in the 28th percentile nationally for seismic hazard - higher than 28% of the 4,875 US cities USGS was checked against here.

Where Center Line sits in Michigan

USGS's underlying values for Center Line: 0.048g peak ground acceleration, 0.097g at short period, 0.045g at 1 second. Within Michigan alone, Center Line ranks 66 of 153 cities by seismic hazard - the 57th percentile in-state. Center Line has a population of about 8,533.

Retrofit economics for Center Line

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.

Earthquake insurance for a Center Line home

A Center Line 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 Center Line's figures come from

Center Line'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 Center Line.