Does Rolla, MO need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Rolla in Seismic Design Category D: High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. That puts Rolla in the 80th percentile nationally for seismic hazard - higher than 80% of the 4,875 US cities USGS was checked against here.

Rolla by the numbers

USGS's underlying values for Rolla: 0.14g peak ground acceleration, 0.281g at short period, 0.136g at 1 second. Within Missouri alone, Rolla ranks 67 of 135 cities by seismic hazard - the 51th percentile in-state. Rolla has a population of about 20,660.

What a retrofit costs in Rolla

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 Missouri 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 Missouri.

What this means for insurance

A Rolla 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 Rolla's figures come from

Rolla's Category D 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 D does and doesn't tell you about Rolla.