Ione's Seismic Design Category, explained

Ione carries Seismic Design Category C under USGS's ASCE 7-16 model. Moderate seismic hazard. Code adds irregular-building restrictions and requires bracing of some nonstructural components (e.g. tall shelving, water heaters) in addition to structural detailing. That puts Ione in the 75th percentile nationally for seismic hazard - higher than 75% of the 4,875 US cities USGS was checked against here.

Ione by the numbers

The raw figures: peak ground acceleration 0.162g, short-period spectral response 0.385g, 1-second spectral response 0.2g. Among 429 California cities in this dataset, Ione ranks 429 for seismic hazard, the 0th percentile within the state. About 9,411 people live in Ione, California.

Bracing and bolting: the actual cost

Because Ione is in California, the EBB grant applies if the ZIP code participates and the house qualifies (wood-framed house on a raised (not slab-on-grade) foundation, built before 1980): a $3,000-$7,000 bracing-and-bolting job drops to $0-$4,000 after the $3,000 base grant, or effectively free for income-eligible households getting the full $10,000.

What this means for insurance

Earthquake coverage in California mostly runs through the California Earthquake Authority (CEA), sold only through licensed agents at CEA-participating insurers - there is no direct-to-consumer CEA policy. A general home-insurance quote is the practical starting point for a Ione homeowner asking about it.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Ione's numbers. The retrofit cost and grant guide covers every EBB eligibility rule, including the ones this page can't check.