Does Leavenworth, KS need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Leavenworth is 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 Leavenworth sits at the 25th percentile for seismic hazard among 4,875 US cities.

How Leavenworth compares

The raw figures: peak ground acceleration 0.044g, short-period spectral response 0.092g, 1-second spectral response 0.065g. Among 63 Kansas cities in this dataset, Leavenworth ranks 36 for seismic hazard, the 44th percentile within the state. About 37,370 people live in Leavenworth, Kansas.

Bracing and bolting: the actual cost

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

Earthquake insurance for a Leavenworth home

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 Leavenworth address.

More on how this number was built

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