Does Westland, MI need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Westland in Seismic Design 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 Westland sits at the 31th percentile for seismic hazard among 4,875 US cities.

How Westland compares

USGS's underlying values for Westland: 0.051g peak ground acceleration, 0.103g at short period, 0.047g at 1 second. Within Michigan alone, Westland ranks 39 of 153 cities by seismic hazard - the 75th percentile in-state. Westland has a population of about 82,745.

Retrofit economics for Westland

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 Westland 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 Westland's figures come from

Westland'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 Westland.