Does Westfield, NJ need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Westfield 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 Westfield sits at the 63th percentile for seismic hazard among 4,875 US cities.

Westfield by the numbers

The raw figures: peak ground acceleration 0.167g, short-period spectral response 0.274g, 1-second spectral response 0.058g. Among 194 New Jersey cities in this dataset, Westfield ranks 89 for seismic hazard, the 54th percentile within the state. About 32,050 people live in Westfield, New Jersey.

Retrofit economics for Westfield

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

Earthquake insurance for a Westfield 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 Westfield address.

More on how this number was built

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