Does Sturgis, MI need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Sturgis is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Sturgis in the 41th percentile nationally for seismic hazard - higher than 41% of the 4,875 US cities USGS was checked against here.

How Sturgis compares

The raw figures: peak ground acceleration 0.065g, short-period spectral response 0.126g, 1-second spectral response 0.058g. Among 153 Michigan cities in this dataset, Sturgis ranks 3 for seismic hazard, the 99th percentile within the state. About 11,030 people live in Sturgis, 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.

Earthquake insurance for a Sturgis home

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 Sturgis address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Sturgis'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.