Does Seminole, OK need an earthquake retrofit?

Seminole 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. That puts Seminole in the 60th percentile nationally for seismic hazard - higher than 60% of the 4,875 US cities USGS was checked against here.

How Seminole compares

USGS's underlying values for Seminole: 0.133g peak ground acceleration, 0.236g at short period, 0.078g at 1 second. Within Oklahoma alone, Seminole ranks 33 of 75 cities by seismic hazard - the 57th percentile in-state. Seminole has a population of about 7,264.

Retrofit economics for Seminole

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 Seminole 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 Seminole's figures come from

Seminole'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 Seminole.