Does Grapevine, TX need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Grapevine is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Grapevine ranks above 30% of the 4,875 cities in this dataset for seismic hazard - the 30th percentile.

How Grapevine compares

The raw figures: peak ground acceleration 0.05g, short-period spectral response 0.102g, 1-second spectral response 0.054g. Among 384 Texas cities in this dataset, Grapevine ranks 85 for seismic hazard, the 78th percentile within the state. About 51,320 people live in Grapevine, Texas.

Retrofit economics for Grapevine

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Texas. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

What this means for insurance

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Grapevine address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Grapevine's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.