Does Natchez, MS need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Natchez is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Natchez ranks above 29% of the 4,875 cities in this dataset for seismic hazard - the 29th percentile.

Natchez by the numbers

The raw figures: peak ground acceleration 0.049g, short-period spectral response 0.103g, 1-second spectral response 0.068g. Among 61 Mississippi cities in this dataset, Natchez ranks 47 for seismic hazard, the 23th percentile within the state. About 14,233 people live in Natchez, Mississippi.

Bracing and bolting: the actual cost

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 Natchez 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 Natchez address.

More on how this number was built

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