Does Millbrook, AL need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Millbrook is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Millbrook sits at the 49th percentile for seismic hazard among 4,875 US cities.

Millbrook by the numbers

USGS's underlying values for Millbrook: 0.075g peak ground acceleration, 0.15g at short period, 0.077g at 1 second. Within Alabama alone, Millbrook ranks 69 of 107 cities by seismic hazard - the 36th percentile in-state. Millbrook has a population of about 17,392.

What a retrofit costs in Millbrook

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 Alabama 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 Alabama.

Insuring against this, not just retrofitting

A Millbrook 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 Millbrook's figures come from

Millbrook's Category B 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 B does and doesn't tell you about Millbrook.