Does Shippensburg, PA need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Shippensburg is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Rank it against the rest of the country and Shippensburg sits at the 15th percentile for seismic hazard among 4,875 US cities.

Where Shippensburg sits in Pennsylvania

The raw figures: peak ground acceleration 0.059g, short-period spectral response 0.117g, 1-second spectral response 0.041g. Among 193 Pennsylvania cities in this dataset, Shippensburg ranks 166 for seismic hazard, the 14th percentile within the state. About 5,638 people live in Shippensburg, 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.

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 Shippensburg address.

More on how this number was built

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