Does Chesapeake, VA need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Chesapeake is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Nationally, Chesapeake ranks above 13% of the 4,875 cities in this dataset for seismic hazard - the 13th percentile.

How Chesapeake compares

The raw figures: peak ground acceleration 0.04g, short-period spectral response 0.084g, 1-second spectral response 0.04g. Among 63 Virginia cities in this dataset, Chesapeake ranks 62 for seismic hazard, the 2th percentile within the state. About 254,997 people live in Chesapeake, Virginia.

What a retrofit costs in Chesapeake

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.

Insuring against this, not just retrofitting

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 Chesapeake address.

More on how this number was built

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