Clifton Heights, PA: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Clifton Heights is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Clifton Heights in the 56th percentile nationally for seismic hazard - higher than 56% of the 4,875 US cities USGS was checked against here.

Where Clifton Heights sits in Pennsylvania

The raw figures: peak ground acceleration 0.1g, short-period spectral response 0.18g, 1-second spectral response 0.047g. Among 193 Pennsylvania cities in this dataset, Clifton Heights ranks 39 for seismic hazard, the 80th percentile within the state. About 6,880 people live in Clifton Heights, Pennsylvania.

What a retrofit costs in Clifton Heights

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

What this means for insurance

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 Clifton Heights address.

More on how this number was built

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