Does Ecorse, MI need an earthquake retrofit?

Ecorse carries Seismic Design Category B under USGS's ASCE 7-16 model. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Ecorse ranks above 32% of the 4,875 cities in this dataset for seismic hazard - the 32th percentile.

How Ecorse compares

The raw figures: peak ground acceleration 0.054g, short-period spectral response 0.107g, 1-second spectral response 0.047g. Among 153 Michigan cities in this dataset, Ecorse ranks 28 for seismic hazard, the 82th percentile within the state. About 8,938 people live in Ecorse, Michigan.

Bracing and bolting: the actual cost

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Michigan. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

What this means for insurance

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Ecorse address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Ecorse's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.