Does Blacksburg, VA need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Blacksburg is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Blacksburg in the 61th percentile nationally for seismic hazard - higher than 61% of the 4,875 US cities USGS was checked against here.

Blacksburg by the numbers

The raw figures: peak ground acceleration 0.136g, short-period spectral response 0.234g, 1-second spectral response 0.069g. Among 63 Virginia cities in this dataset, Blacksburg ranks 11 for seismic hazard, the 84th percentile within the state. About 45,452 people live in Blacksburg, Virginia.

Bracing and bolting: the actual cost

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 Blacksburg address.

More on how this number was built

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