D'Iberville, MS: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, D'Iberville is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts D'Iberville in the 27th percentile nationally for seismic hazard - higher than 27% of the 4,875 US cities USGS was checked against here.

D'Iberville by the numbers

The raw figures: peak ground acceleration 0.046g, short-period spectral response 0.095g, 1-second spectral response 0.059g. Among 61 Mississippi cities in this dataset, D'Iberville ranks 53 for seismic hazard, the 13th percentile within the state. About 13,399 people live in D'Iberville, Mississippi.

Retrofit economics for D'Iberville

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

Earthquake insurance for a D'Iberville 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 D'Iberville address.

More on how this number was built

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