Tigard, OR: what USGS's seismic model says

Under the seismic model IBC and ASCE 7 use for new construction, Tigard is Category D. High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. Rank it against the rest of the country and Tigard sits at the 87th percentile for seismic hazard among 4,875 US cities.

Where Tigard sits in Oregon

USGS's underlying values for Tigard: 0.389g peak ground acceleration, 0.853g at short period, 0.394g at 1 second. Within Oregon alone, Tigard ranks 34 of 80 cities by seismic hazard - the 58th percentile in-state. Tigard has a population of about 57,301.

Retrofit economics for Tigard

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 Oregon 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 Oregon.

What this means for insurance

A Tigard 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 Tigard's figures come from

Tigard's Category D 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 D does and doesn't tell you about Tigard.