Princeton's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Princeton is 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. Nationally, Princeton ranks above 86% of the 4,875 cities in this dataset for seismic hazard - the 86th percentile.

Where Princeton sits in Kentucky

USGS's underlying values for Princeton: 0.328g peak ground acceleration, 0.591g at short period, 0.222g at 1 second. Within Kentucky alone, Princeton ranks 4 of 79 cities by seismic hazard - the 96th percentile in-state. Princeton has a population of about 6,223.

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 Kentucky 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 Kentucky.

What this means for insurance

A Princeton 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 Princeton's figures come from

Princeton'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 Princeton.