Does Salem, MA need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Salem is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Salem in the 66th percentile nationally for seismic hazard - higher than 66% of the 4,875 US cities USGS was checked against here.

Where Salem sits in Massachusetts

USGS's underlying values for Salem: 0.184g peak ground acceleration, 0.302g at short period, 0.069g at 1 second. Within Massachusetts alone, Salem ranks 11 of 58 cities by seismic hazard - the 82th percentile in-state. Salem has a population of about 45,677.

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 Massachusetts 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 Massachusetts.

Insuring against this, not just retrofitting

A Salem 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 Salem's figures come from

Salem'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 Salem.