Van Alstyne's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Van Alstyne 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 Van Alstyne sits at the 45th percentile for seismic hazard among 4,875 US cities.

How Van Alstyne compares

USGS's underlying values for Van Alstyne: 0.07g peak ground acceleration, 0.138g at short period, 0.063g at 1 second. Within Texas alone, Van Alstyne ranks 24 of 384 cities by seismic hazard - the 94th percentile in-state. Van Alstyne has a population of about 7,220.

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 Texas 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 Texas.

Earthquake insurance for a Van Alstyne home

A Van Alstyne 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 Van Alstyne's figures come from

Van Alstyne'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 Van Alstyne.