Does Bethlehem, PA need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Bethlehem in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Bethlehem ranks above 55% of the 4,875 cities in this dataset for seismic hazard - the 55th percentile.

Where Bethlehem sits in Pennsylvania

The raw figures: peak ground acceleration 0.096g, short-period spectral response 0.175g, 1-second spectral response 0.048g. Among 193 Pennsylvania cities in this dataset, Bethlehem ranks 52 for seismic hazard, the 73th percentile within the state. About 79,453 people live in Bethlehem, Pennsylvania.

What a retrofit costs in Bethlehem

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 Bethlehem address.

More on how this number was built

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