Mountain Brook's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Mountain Brook in Seismic Design Category C: 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. Nationally, Mountain Brook ranks above 76% of the 4,875 cities in this dataset for seismic hazard - the 76th percentile.

Mountain Brook by the numbers

USGS's underlying values for Mountain Brook: 0.173g peak ground acceleration, 0.295g at short period, 0.101g at 1 second. Within Alabama alone, Mountain Brook ranks 20 of 107 cities by seismic hazard - the 82th percentile in-state. Mountain Brook has a population of about 21,701.

Retrofit economics for Mountain Brook

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.

Earthquake insurance for a Mountain Brook home

A Mountain Brook 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 Mountain Brook's figures come from

Mountain Brook'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 Mountain Brook.