Mason, MI: what USGS's seismic model says

Mason carries Seismic Design Category B under USGS's ASCE 7-16 model. 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 Mason sits at the 28th percentile for seismic hazard among 4,875 US cities.

Where Mason sits in Michigan

USGS's underlying values for Mason: 0.048g peak ground acceleration, 0.097g at short period, 0.047g at 1 second. Within Michigan alone, Mason ranks 67 of 153 cities by seismic hazard - the 57th percentile in-state. Mason has a population of about 8,314.

What a retrofit costs in Mason

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 Michigan 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 Michigan.

What this means for insurance

A Mason 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 Mason's figures come from

Mason'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 Mason.