Does Alma, MI need an earthquake retrofit?

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Alma in Seismic Design Category A: Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. That puts Alma in the 12th percentile nationally for seismic hazard - higher than 12% of the 4,875 US cities USGS was checked against here.

Alma by the numbers

The raw figures: peak ground acceleration 0.034g, short-period spectral response 0.07g, 1-second spectral response 0.041g. Among 153 Michigan cities in this dataset, Alma ranks 131 for seismic hazard, the 14th percentile within the state. About 9,349 people live in Alma, Michigan.

Retrofit economics for Alma

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Michigan. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

What this means for insurance

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Alma address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Alma's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.