Does Plattsmouth, NE need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Plattsmouth 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 Plattsmouth sits at the 18th percentile for seismic hazard among 4,875 US cities.

Plattsmouth by the numbers

USGS's underlying values for Plattsmouth: 0.035g peak ground acceleration, 0.074g at short period, 0.047g at 1 second. Within Nebraska alone, Plattsmouth ranks 20 of 32 cities by seismic hazard - the 39th percentile in-state. Plattsmouth has a population of about 6,887.

What a retrofit costs in Plattsmouth

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 Nebraska 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 Nebraska.

Insuring against this, not just retrofitting

A Plattsmouth 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 Plattsmouth's figures come from

Plattsmouth'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 Plattsmouth.