Does Suffern, NY need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Suffern is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Suffern in the 64th percentile nationally for seismic hazard - higher than 64% of the 4,875 US cities USGS was checked against here.

Suffern by the numbers

USGS's underlying values for Suffern: 0.177g peak ground acceleration, 0.287g at short period, 0.061g at 1 second. Within New York alone, Suffern ranks 36 of 170 cities by seismic hazard - the 79th percentile in-state. Suffern has a population of about 11,537.

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 York 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 York.

Insuring against this, not just retrofitting

A Suffern 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 Suffern's figures come from

Suffern'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 Suffern.