Does Linwood, NJ need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Linwood is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Rank it against the rest of the country and Linwood sits at the 15th percentile for seismic hazard among 4,875 US cities.

How Linwood compares

USGS's underlying values for Linwood: 0.062g peak ground acceleration, 0.121g at short period, 0.04g at 1 second. Within New Jersey alone, Linwood ranks 189 of 194 cities by seismic hazard - the 3th percentile in-state. Linwood has a population of about 7,072.

Retrofit economics for Linwood

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 Linwood 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 Linwood's figures come from

Linwood's Category A 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 A does and doesn't tell you about Linwood.