Port Isabel's Seismic Design Category, explained

Port Isabel carries Seismic Design Category A under USGS's ASCE 7-16 model. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Rank it against the rest of the country and Port Isabel sits at the 0th percentile for seismic hazard among 4,875 US cities.

Port Isabel by the numbers

USGS's underlying values for Port Isabel: 0.017g peak ground acceleration, 0.038g at short period, 0.013g at 1 second. Within Texas alone, Port Isabel ranks 384 of 384 cities by seismic hazard - the 0th percentile in-state. Port Isabel has a population of about 5,210.

Retrofit economics for Port Isabel

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 Port Isabel home

A Port Isabel 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 Port Isabel's figures come from

Port Isabel's Category A 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 A does and doesn't tell you about Port Isabel.