Mamaroneck, NY: what USGS's seismic model says

Mamaroneck 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. Nationally, Mamaroneck ranks above 64% of the 4,875 cities in this dataset for seismic hazard - the 64th percentile.

Mamaroneck by the numbers

The raw figures: peak ground acceleration 0.175g, short-period spectral response 0.285g, 1-second spectral response 0.06g. Among 170 New York cities in this dataset, Mamaroneck ranks 39 for seismic hazard, the 78th percentile within the state. About 19,783 people live in Mamaroneck, New York.

What a retrofit costs in Mamaroneck

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for New York. 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 Mamaroneck address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Mamaroneck'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.