Somerdale's Seismic Design Category, explained

Somerdale carries Seismic Design Category B under USGS's ASCE 7-16 model. 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 Somerdale sits at the 54th percentile for seismic hazard among 4,875 US cities.

Where Somerdale sits in New Jersey

USGS's underlying values for Somerdale: 0.095g peak ground acceleration, 0.173g at short period, 0.046g at 1 second. Within New Jersey alone, Somerdale ranks 170 of 194 cities by seismic hazard - the 12th percentile in-state. Somerdale has a population of about 5,712.

Retrofit economics for Somerdale

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 Somerdale 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 Somerdale's figures come from

Somerdale'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 Somerdale.