Does Opp, AL need an earthquake retrofit?

Opp carries Seismic Design Category B under USGS's ASCE 7-16 model. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Opp sits at the 22th percentile for seismic hazard among 4,875 US cities.

Opp by the numbers

USGS's underlying values for Opp: 0.042g peak ground acceleration, 0.09g at short period, 0.061g at 1 second. Within Alabama alone, Opp ranks 100 of 107 cities by seismic hazard - the 7th percentile in-state. Opp has a population of about 6,706.

What a retrofit costs in Opp

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 Opp 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 Opp's figures come from

Opp's Category B 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 B does and doesn't tell you about Opp.