Altoona's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Altoona in Seismic Design Category A: Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Rank it against the rest of the country and Altoona sits at the 3th percentile for seismic hazard among 4,875 US cities.

Where Altoona sits in Wisconsin

USGS's underlying values for Altoona: 0.022g peak ground acceleration, 0.045g at short period, 0.033g at 1 second. Within Wisconsin alone, Altoona ranks 148 of 157 cities by seismic hazard - the 6th percentile in-state. Altoona has a population of about 9,302.

Retrofit economics for Altoona

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.

Earthquake insurance for a Altoona home

A Altoona 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 Altoona's figures come from

Altoona'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 Altoona.