Does Quincy, MA need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Quincy in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Quincy sits at the 61th percentile for seismic hazard among 4,875 US cities.

How Quincy compares

The raw figures: peak ground acceleration 0.144g, short-period spectral response 0.247g, 1-second spectral response 0.062g. Among 58 Massachusetts cities in this dataset, Quincy ranks 30 for seismic hazard, the 49th percentile within the state. About 103,434 people live in Quincy, Massachusetts.

Retrofit economics for Quincy

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Massachusetts. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Earthquake insurance for a Quincy 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 Quincy address.

More on how this number was built

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