Does Trenton, NJ need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Trenton is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Trenton ranks above 60% of the 4,875 cities in this dataset for seismic hazard - the 60th percentile.

How Trenton compares

USGS's underlying values for Trenton: 0.121g peak ground acceleration, 0.21g at short period, 0.051g at 1 second. Within New Jersey alone, Trenton ranks 151 of 194 cities by seismic hazard - the 22th percentile in-state. Trenton has a population of about 91,193.

What a retrofit costs in Trenton

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by New Jersey specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in New Jersey.

Insuring against this, not just retrofitting

A Trenton homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Trenton's figures come from

Trenton's Category B and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category B does and doesn't tell you about Trenton.