Does Malden, MA need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Malden in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Malden in the 64th percentile nationally for seismic hazard - higher than 64% of the 4,875 US cities USGS was checked against here.

How Malden compares

The raw figures: peak ground acceleration 0.174g, short-period spectral response 0.289g, 1-second spectral response 0.068g. Among 58 Massachusetts cities in this dataset, Malden ranks 15 for seismic hazard, the 75th percentile within the state. About 66,693 people live in Malden, Massachusetts.

Bracing and bolting: the actual cost

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Massachusetts. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Insuring against this, not just retrofitting

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Malden address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Malden's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.