Columbus's Seismic Design Category, explained

Columbus carries Seismic Design Category C under USGS's ASCE 7-16 model. Moderate seismic hazard. Code adds irregular-building restrictions and requires bracing of some nonstructural components (e.g. tall shelving, water heaters) in addition to structural detailing. Rank it against the rest of the country and Columbus sits at the 72th percentile for seismic hazard among 4,875 US cities.

Columbus by the numbers

USGS's underlying values for Columbus: 0.119g peak ground acceleration, 0.236g at short period, 0.112g at 1 second. Within Mississippi alone, Columbus ranks 21 of 61 cities by seismic hazard - the 67th percentile in-state. Columbus has a population of about 22,820.

Retrofit economics for Columbus

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Mississippi specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Mississippi.

Insuring against this, not just retrofitting

A Columbus homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Columbus's figures come from

Columbus's Category C and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category C does and doesn't tell you about Columbus.