Vienna's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Vienna is Category B. 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 Vienna sits at the 46th percentile for seismic hazard among 4,875 US cities.

Where Vienna sits in Virginia

USGS's underlying values for Vienna: 0.071g peak ground acceleration, 0.136g at short period, 0.044g at 1 second. Within Virginia alone, Vienna ranks 40 of 63 cities by seismic hazard - the 37th percentile in-state. Vienna has a population of about 16,562.

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 Virginia 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 Virginia.

Earthquake insurance for a Vienna home

A Vienna 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 Vienna's figures come from

Vienna'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 Vienna.