Does Davison, MI need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Davison is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Nationally, Davison ranks above 13% of the 4,875 cities in this dataset for seismic hazard - the 13th percentile.

Where Davison sits in Michigan

USGS's underlying values for Davison: 0.038g peak ground acceleration, 0.078g at short period, 0.042g at 1 second. Within Michigan alone, Davison ranks 128 of 153 cities by seismic hazard - the 16th percentile in-state. Davison has a population of about 5,059.

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 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.

Earthquake insurance for a Davison home

A Davison 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 Davison's figures come from

Davison'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 Davison.