Collinsville's Seismic Design Category, explained

Collinsville 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. Nationally, Collinsville ranks above 34% of the 4,875 cities in this dataset for seismic hazard - the 34th percentile.

How Collinsville compares

USGS's underlying values for Collinsville: 0.057g peak ground acceleration, 0.121g at short period, 0.071g at 1 second. Within Oklahoma alone, Collinsville ranks 71 of 75 cities by seismic hazard - the 5th percentile in-state. Collinsville has a population of about 9,757.

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 Collinsville 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 Collinsville's figures come from

Collinsville'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 Collinsville.