Does Jacksonville, AL need an earthquake retrofit?

Jacksonville 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. Rank it against the rest of the country and Jacksonville sits at the 74th percentile for seismic hazard among 4,875 US cities.

How Jacksonville compares

USGS's underlying values for Jacksonville: 0.141g peak ground acceleration, 0.253g at short period, 0.094g at 1 second. Within Alabama alone, Jacksonville ranks 52 of 107 cities by seismic hazard - the 52th percentile in-state. Jacksonville has a population of about 14,651.

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 Alabama 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 Alabama.

What this means for insurance

A Jacksonville 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 Jacksonville's figures come from

Jacksonville's Category C 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 C does and doesn't tell you about Jacksonville.