Does Manhattan, KS need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Manhattan in Seismic Design Category B: 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 Manhattan sits at the 25th percentile for seismic hazard among 4,875 US cities.

Manhattan by the numbers

USGS's underlying values for Manhattan: 0.044g peak ground acceleration, 0.091g at short period, 0.054g at 1 second. Within Kansas alone, Manhattan ranks 35 of 63 cities by seismic hazard - the 45th percentile in-state. Manhattan has a population of about 54,700.

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 Kansas 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 Kansas.

What this means for insurance

A Manhattan 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 Manhattan's figures come from

Manhattan'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 Manhattan.