Oshkosh, WI: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Oshkosh is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Nationally, Oshkosh ranks above 9% of the 4,875 cities in this dataset for seismic hazard - the 9th percentile.

Where Oshkosh sits in Wisconsin

The raw figures: peak ground acceleration 0.027g, short-period spectral response 0.056g, 1-second spectral response 0.039g. Among 157 Wisconsin cities in this dataset, Oshkosh ranks 103 for seismic hazard, the 35th percentile within the state. About 67,242 people live in Oshkosh, Wisconsin.

Retrofit economics for Oshkosh

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Wisconsin. 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 Oshkosh address.

More on how this number was built

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