Gardiner's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Gardiner is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Gardiner ranks above 67% of the 4,875 cities in this dataset for seismic hazard - the 67th percentile.

How Gardiner compares

USGS's underlying values for Gardiner: 0.188g peak ground acceleration, 0.309g at short period, 0.076g at 1 second. Within Maine alone, Gardiner ranks 5 of 20 cities by seismic hazard - the 79th percentile in-state. Gardiner has a population of about 6,160.

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 Maine 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 Maine.

Earthquake insurance for a Gardiner home

A Gardiner 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 Gardiner's figures come from

Gardiner'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 Gardiner.