Does Byram, MS need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Byram is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Byram in the 40th percentile nationally for seismic hazard - higher than 40% of the 4,875 US cities USGS was checked against here.

Where Byram sits in Mississippi

The raw figures: peak ground acceleration 0.064g, short-period spectral response 0.133g, 1-second spectral response 0.08g. Among 61 Mississippi cities in this dataset, Byram ranks 41 for seismic hazard, the 33th percentile within the state. About 12,656 people live in Byram, Mississippi.

Retrofit economics for Byram

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 Byram 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 Byram address.

More on how this number was built

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