Aberdeen's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Aberdeen is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Nationally, Aberdeen ranks above 13% of the 4,875 cities in this dataset for seismic hazard - the 13th percentile.

Where Aberdeen sits in South Dakota

The raw figures: peak ground acceleration 0.039g, short-period spectral response 0.08g, 1-second spectral response 0.025g. Among 18 South Dakota cities in this dataset, Aberdeen ranks 18 for seismic hazard, the 0th percentile within the state. About 27,919 people live in Aberdeen, South Dakota.

What a retrofit costs in Aberdeen

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

Earthquake insurance for a Aberdeen 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 Aberdeen address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Aberdeen'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.