Glen Rock's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Glen Rock 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 Glen Rock sits at the 65th percentile for seismic hazard among 4,875 US cities.

Where Glen Rock sits in New Jersey

USGS's underlying values for Glen Rock: 0.182g peak ground acceleration, 0.294g at short period, 0.061g at 1 second. Within New Jersey alone, Glen Rock ranks 39 of 194 cities by seismic hazard - the 80th percentile in-state. Glen Rock has a population of about 12,346.

Retrofit economics for Glen Rock

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 Rock 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 Rock's figures come from

Glen Rock'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 Rock.