Does Henryetta, OK need an earthquake retrofit?

Henryetta carries Seismic Design Category B under USGS's ASCE 7-16 model. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Henryetta sits at the 54th percentile for seismic hazard among 4,875 US cities.

How Henryetta compares

USGS's underlying values for Henryetta: 0.093g peak ground acceleration, 0.177g at short period, 0.076g at 1 second. Within Oklahoma alone, Henryetta ranks 42 of 75 cities by seismic hazard - the 45th percentile in-state. Henryetta has a population of about 5,606.

What a retrofit costs in Henryetta

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.

What this means for insurance

A Henryetta 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 Henryetta's figures come from

Henryetta's Category B 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 B does and doesn't tell you about Henryetta.