Antigo's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Antigo is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Nationally, Antigo ranks above 3% of the 4,875 cities in this dataset for seismic hazard - the 3th percentile.

How Antigo compares

USGS's underlying values for Antigo: 0.022g peak ground acceleration, 0.046g at short period, 0.032g at 1 second. Within Wisconsin alone, Antigo ranks 149 of 157 cities by seismic hazard - the 5th percentile in-state. Antigo has a population of about 8,096.

What a retrofit costs in Antigo

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 Wisconsin 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 Wisconsin.

Insuring against this, not just retrofitting

A Antigo 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 Antigo's figures come from

Antigo's Category A 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 A does and doesn't tell you about Antigo.