Vincennes's Seismic Design Category, explained

Vincennes 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. Rank it against the rest of the country and Vincennes sits at the 85th percentile for seismic hazard among 4,875 US cities.

Where Vincennes sits in Indiana

USGS's underlying values for Vincennes: 0.29g peak ground acceleration, 0.491g at short period, 0.16g at 1 second. Within Indiana alone, Vincennes ranks 4 of 126 cities by seismic hazard - the 98th percentile in-state. Vincennes has a population of about 16,506.

Retrofit economics for Vincennes

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 Indiana 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 Indiana.

What this means for insurance

A Vincennes 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 Vincennes's figures come from

Vincennes'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 Vincennes.