SeaTac, WA: what USGS's seismic model says

SeaTac 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. Nationally, SeaTac ranks above 94% of the 4,875 cities in this dataset for seismic hazard - the 94th percentile.

Where SeaTac sits in Washington

The raw figures: peak ground acceleration 0.628g, short-period spectral response 1.478g, 1-second spectral response 0.502g. Among 125 Washington cities in this dataset, SeaTac ranks 12 for seismic hazard, the 91th percentile within the state. About 34,024 people live in SeaTac, Washington.

What a retrofit costs in SeaTac

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

Earthquake insurance for a SeaTac 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 SeaTac address.

More on how this number was built

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