Doylestown, PA: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Doylestown in Seismic Design Category B: 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 Doylestown sits at the 58th percentile for seismic hazard among 4,875 US cities.

Doylestown by the numbers

The raw figures: peak ground acceleration 0.108g, short-period spectral response 0.193g, 1-second spectral response 0.049g. Among 193 Pennsylvania cities in this dataset, Doylestown ranks 5 for seismic hazard, the 98th percentile within the state. About 8,382 people live in Doylestown, Pennsylvania.

Retrofit economics for Doylestown

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 Doylestown address.

More on how this number was built

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