Topeka's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Topeka is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Topeka ranks above 30% of the 4,875 cities in this dataset for seismic hazard - the 30th percentile.

Where Topeka sits in Kansas

USGS's underlying values for Topeka: 0.05g peak ground acceleration, 0.102g at short period, 0.062g at 1 second. Within Kansas alone, Topeka ranks 4 of 63 cities by seismic hazard - the 95th percentile in-state. Topeka has a population of about 125,467.

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 Kansas 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 Kansas.

Earthquake insurance for a Topeka home

A Topeka 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 Topeka's figures come from

Topeka'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 Topeka.