Does Allentown, PA need an earthquake retrofit?

Allentown carries Seismic Design Category B under USGS's ASCE 7-16 model. 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 Allentown sits at the 54th percentile for seismic hazard among 4,875 US cities.

How Allentown compares

The raw figures: peak ground acceleration 0.092g, short-period spectral response 0.169g, 1-second spectral response 0.047g. Among 193 Pennsylvania cities in this dataset, Allentown ranks 59 for seismic hazard, the 70th percentile within the state. About 127,138 people live in Allentown, Pennsylvania.

Retrofit economics for Allentown

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 Allentown address.

More on how this number was built

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