Lansdale, PA: what USGS's seismic model says

Lansdale 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. That puts Lansdale in the 57th percentile nationally for seismic hazard - higher than 57% of the 4,875 US cities USGS was checked against here.

Where Lansdale sits in Pennsylvania

The raw figures: peak ground acceleration 0.103g, short-period spectral response 0.185g, 1-second spectral response 0.048g. Among 193 Pennsylvania cities in this dataset, Lansdale ranks 17 for seismic hazard, the 92th percentile within the state. About 19,154 people live in Lansdale, Pennsylvania.

Retrofit economics for Lansdale

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 Lansdale address.

More on how this number was built

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