Mount Joy, PA: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Mount Joy is 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 Mount Joy sits at the 54th percentile for seismic hazard among 4,875 US cities.

Mount Joy by the numbers

The raw figures: peak ground acceleration 0.095g, short-period spectral response 0.173g, 1-second spectral response 0.046g. Among 193 Pennsylvania cities in this dataset, Mount Joy ranks 56 for seismic hazard, the 71th percentile within the state. About 8,364 people live in Mount Joy, 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 Mount Joy 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 Mount Joy address.

More on how this number was built

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