Cedar Rapids's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Cedar Rapids is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts Cedar Rapids in the 17th percentile nationally for seismic hazard - higher than 17% of the 4,875 US cities USGS was checked against here.

Where Cedar Rapids sits in Iowa

The raw figures: peak ground acceleration 0.033g, short-period spectral response 0.069g, 1-second spectral response 0.055g. Among 85 Iowa cities in this dataset, Cedar Rapids ranks 27 for seismic hazard, the 69th percentile within the state. About 137,904 people live in Cedar Rapids, Iowa.

Retrofit economics for Cedar Rapids

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Iowa. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Earthquake insurance for a Cedar Rapids home

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Cedar Rapids address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Cedar Rapids's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.