Clayton's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Clayton 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. Rank it against the rest of the country and Clayton sits at the 83th percentile for seismic hazard among 4,875 US cities.

Where Clayton sits in Missouri

USGS's underlying values for Clayton: 0.24g peak ground acceleration, 0.424g at short period, 0.155g at 1 second. Within Missouri alone, Clayton ranks 27 of 135 cities by seismic hazard - the 81th percentile in-state. Clayton has a population of about 17,512.

Retrofit economics for Clayton

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.

Earthquake insurance for a Clayton home

A Clayton 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 Clayton's figures come from

Clayton'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 Clayton.