Tuttle's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Tuttle is Category C. 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 Tuttle sits at the 78th percentile for seismic hazard among 4,875 US cities.

Where Tuttle sits in Oklahoma

USGS's underlying values for Tuttle: 0.224g peak ground acceleration, 0.361g at short period, 0.086g at 1 second. Within Oklahoma alone, Tuttle ranks 6 of 75 cities by seismic hazard - the 93th percentile in-state. Tuttle has a population of about 8,584.

Bracing and bolting: the actual cost

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 Oklahoma 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 Oklahoma.

Insuring against this, not just retrofitting

A Tuttle 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 Tuttle's figures come from

Tuttle'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 Tuttle.