Sherwood, OR: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Sherwood in Seismic Design 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 Sherwood sits at the 87th percentile for seismic hazard among 4,875 US cities.

Where Sherwood sits in Oregon

USGS's underlying values for Sherwood: 0.381g peak ground acceleration, 0.833g at short period, 0.393g at 1 second. Within Oregon alone, Sherwood ranks 44 of 80 cities by seismic hazard - the 46th percentile in-state. Sherwood has a population of about 20,441.

What a retrofit costs in Sherwood

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.

Insuring against this, not just retrofitting

A Sherwood 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 Sherwood's figures come from

Sherwood'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 Sherwood.