Lone Tree's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Lone Tree is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Lone Tree sits at the 59th percentile for seismic hazard among 4,875 US cities.

Where Lone Tree sits in Colorado

The raw figures: peak ground acceleration 0.116g, short-period spectral response 0.211g, 1-second spectral response 0.058g. Among 79 Colorado cities in this dataset, Lone Tree ranks 39 for seismic hazard, the 51th percentile within the state. About 14,061 people live in Lone Tree, Colorado.

What a retrofit costs in Lone Tree

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

Insuring against this, not just retrofitting

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 Lone Tree address.

More on how this number was built

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