Oak Grove's Seismic Design Category, explained

Oak Grove carries Seismic Design Category D under USGS's ASCE 7-16 model. High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. That puts Oak Grove in the 82th percentile nationally for seismic hazard - higher than 82% of the 4,875 US cities USGS was checked against here.

How Oak Grove compares

The raw figures: peak ground acceleration 0.222g, short-period spectral response 0.425g, 1-second spectral response 0.183g. Among 79 Kentucky cities in this dataset, Oak Grove ranks 8 for seismic hazard, the 91th percentile within the state. About 7,973 people live in Oak Grove, Kentucky.

Bracing and bolting: the actual cost

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

Earthquake insurance for a Oak Grove 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 Oak Grove address.

More on how this number was built

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