Harrah's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Harrah is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Harrah in the 61th percentile nationally for seismic hazard - higher than 61% of the 4,875 US cities USGS was checked against here.

Harrah by the numbers

USGS's underlying values for Harrah: 0.145g peak ground acceleration, 0.253g at short period, 0.077g at 1 second. Within Oklahoma alone, Harrah ranks 27 of 75 cities by seismic hazard - the 65th percentile in-state. Harrah has a population of about 6,853.

What a retrofit costs in Harrah

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 Harrah 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 Harrah's figures come from

Harrah'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 Harrah.