Decatur, IN: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Decatur in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Decatur ranks above 46% of the 4,875 cities in this dataset for seismic hazard - the 46th percentile.

How Decatur compares

The raw figures: peak ground acceleration 0.072g, short-period spectral response 0.138g, 1-second spectral response 0.066g. Among 126 Indiana cities in this dataset, Decatur ranks 67 for seismic hazard, the 47th percentile within the state. About 10,072 people live in Decatur, Indiana.

What a retrofit costs in Decatur

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Indiana. 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 Decatur address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Decatur'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.