Johnstown, OH: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Johnstown is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Johnstown ranks above 34% of the 4,875 cities in this dataset for seismic hazard - the 34th percentile.

Johnstown by the numbers

The raw figures: peak ground acceleration 0.056g, short-period spectral response 0.112g, 1-second spectral response 0.057g. Among 254 Ohio cities in this dataset, Johnstown ranks 233 for seismic hazard, the 8th percentile within the state. About 5,356 people live in Johnstown, Ohio.

What a retrofit costs in Johnstown

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

More on how this number was built

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