Does Logan, UT need an earthquake retrofit?

Logan 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 Logan in the 89th percentile nationally for seismic hazard - higher than 89% of the 4,875 US cities USGS was checked against here.

Logan by the numbers

USGS's underlying values for Logan: 0.467g peak ground acceleration, 1.079g at short period, 0.359g at 1 second. Within Utah alone, Logan ranks 60 of 95 cities by seismic hazard - the 37th percentile in-state. Logan has a population of about 56,770.

Bracing and bolting: the actual cost

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Utah specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Utah.

What this means for insurance

A Logan homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Logan's figures come from

Logan's Category D and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category D does and doesn't tell you about Logan.