Does Mapleton, UT need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Mapleton in Seismic Design Category D: 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 Mapleton in the 93th percentile nationally for seismic hazard - higher than 93% of the 4,875 US cities USGS was checked against here.

How Mapleton compares

The raw figures: peak ground acceleration 0.608g, short-period spectral response 1.325g, 1-second spectral response 0.497g. Among 95 Utah cities in this dataset, Mapleton ranks 41 for seismic hazard, the 57th percentile within the state. About 14,812 people live in Mapleton, Utah.

Bracing and bolting: the actual cost

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

Earthquake insurance for a Mapleton 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 Mapleton address.

More on how this number was built

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