Woonsocket, RI: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Woonsocket is 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 Woonsocket sits at the 58th percentile for seismic hazard among 4,875 US cities.

Where Woonsocket sits in Rhode Island

The raw figures: peak ground acceleration 0.111g, short-period spectral response 0.202g, 1-second spectral response 0.057g. Among 8 Rhode Island cities in this dataset, Woonsocket ranks 2 for seismic hazard, the 86th percentile within the state. About 44,508 people live in Woonsocket, Rhode Island.

Bracing and bolting: the actual cost

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Rhode Island. 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 Woonsocket address.

More on how this number was built

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