Gettysburg's Seismic Design Category, explained

Gettysburg 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 Gettysburg sits at the 44th percentile for seismic hazard among 4,875 US cities.

Where Gettysburg sits in Pennsylvania

The raw figures: peak ground acceleration 0.069g, short-period spectral response 0.132g, 1-second spectral response 0.042g. Among 193 Pennsylvania cities in this dataset, Gettysburg ranks 80 for seismic hazard, the 59th percentile within the state. About 8,647 people live in Gettysburg, Pennsylvania.

Bracing and bolting: the actual cost

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.

Earthquake insurance for a Gettysburg home

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 Gettysburg address.

More on how this number was built

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