Grand Rapids, MN: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Grand Rapids in Seismic Design Category A: Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Nationally, Grand Rapids ranks above 2% of the 4,875 cities in this dataset for seismic hazard - the 2th percentile.

How Grand Rapids compares

The raw figures: peak ground acceleration 0.021g, short-period spectral response 0.045g, 1-second spectral response 0.016g. Among 155 Minnesota cities in this dataset, Grand Rapids ranks 144 for seismic hazard, the 7th percentile within the state. About 11,244 people live in Grand Rapids, Minnesota.

Retrofit economics for Grand Rapids

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

Earthquake insurance for a Grand Rapids 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 Grand Rapids address.

More on how this number was built

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