Falls Church's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Falls Church is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Falls Church in the 45th percentile nationally for seismic hazard - higher than 45% of the 4,875 US cities USGS was checked against here.

Where Falls Church sits in Virginia

The raw figures: peak ground acceleration 0.07g, short-period spectral response 0.135g, 1-second spectral response 0.044g. Among 63 Virginia cities in this dataset, Falls Church ranks 43 for seismic hazard, the 32th percentile within the state. About 15,034 people live in Falls Church, Virginia.

Retrofit economics for Falls Church

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Virginia. 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 Falls Church address.

More on how this number was built

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