Hawthorne, NJ: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Hawthorne is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Hawthorne in the 65th percentile nationally for seismic hazard - higher than 65% of the 4,875 US cities USGS was checked against here.

How Hawthorne compares

USGS's underlying values for Hawthorne: 0.18g peak ground acceleration, 0.291g at short period, 0.061g at 1 second. Within New Jersey alone, Hawthorne ranks 55 of 194 cities by seismic hazard - the 72th percentile in-state. Hawthorne has a population of about 20,006.

Bracing and bolting: the actual cost

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 Hawthorne 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 Hawthorne's figures come from

Hawthorne'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 Hawthorne.