Middlesex, NJ: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Middlesex is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Middlesex ranks above 62% of the 4,875 cities in this dataset for seismic hazard - the 62th percentile.

Where Middlesex sits in New Jersey

The raw figures: peak ground acceleration 0.156g, short-period spectral response 0.259g, 1-second spectral response 0.056g. Among 194 New Jersey cities in this dataset, Middlesex ranks 118 for seismic hazard, the 39th percentile within the state. About 14,874 people live in Middlesex, New Jersey.

Bracing and bolting: the actual cost

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.

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 Middlesex address.

More on how this number was built

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