Greenville's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Greenville is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Greenville in the 19th percentile nationally for seismic hazard - higher than 19% of the 4,875 US cities USGS was checked against here.

Greenville by the numbers

The raw figures: peak ground acceleration 0.037g, short-period spectral response 0.076g, 1-second spectral response 0.043g. Among 153 Michigan cities in this dataset, Greenville ranks 117 for seismic hazard, the 24th percentile within the state. About 9,110 people live in Greenville, Michigan.

Retrofit economics for Greenville

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 Greenville 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 Greenville address.

More on how this number was built

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