Liberty's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Liberty is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Liberty in the 26th percentile nationally for seismic hazard - higher than 26% of the 4,875 US cities USGS was checked against here.

Liberty by the numbers

The raw figures: peak ground acceleration 0.045g, short-period spectral response 0.095g, 1-second spectral response 0.069g. Among 135 Missouri cities in this dataset, Liberty ranks 122 for seismic hazard, the 10th percentile within the state. About 31,245 people live in Liberty, Missouri.

Bracing and bolting: the actual cost

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

What this means for insurance

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 Liberty address.

More on how this number was built

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