Does Suffolk, VA need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Suffolk is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. That puts Suffolk in the 14th percentile nationally for seismic hazard - higher than 14% of the 4,875 US cities USGS was checked against here.

How Suffolk compares

The raw figures: peak ground acceleration 0.045g, short-period spectral response 0.093g, 1-second spectral response 0.041g. Among 63 Virginia cities in this dataset, Suffolk ranks 57 for seismic hazard, the 10th percentile within the state. About 103,105 people live in Suffolk, Virginia.

Retrofit economics for Suffolk

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.

Earthquake insurance for a Suffolk 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 Suffolk address.

More on how this number was built

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