Roseville's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Roseville in Seismic Design 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 Roseville sits at the 28th percentile for seismic hazard among 4,875 US cities.

How Roseville compares

The raw figures: peak ground acceleration 0.047g, short-period spectral response 0.096g, 1-second spectral response 0.044g. Among 153 Michigan cities in this dataset, Roseville ranks 74 for seismic hazard, the 52th percentile within the state. About 47,047 people live in Roseville, 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.

Insuring against this, not just retrofitting

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 Roseville address.

More on how this number was built

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