Glen Ridge's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Glen Ridge in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Glen Ridge in the 64th percentile nationally for seismic hazard - higher than 64% of the 4,875 US cities USGS was checked against here.

How Glen Ridge compares

USGS's underlying values for Glen Ridge: 0.177g peak ground acceleration, 0.288g at short period, 0.06g at 1 second. Within New Jersey alone, Glen Ridge ranks 69 of 194 cities by seismic hazard - the 65th percentile in-state. Glen Ridge has a population of about 8,204.

What a retrofit costs in Glen Ridge

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 Glen Ridge 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 Glen Ridge's figures come from

Glen Ridge'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 Glen Ridge.