Is Yolo County, California in an earthquake zone?

Yolo County sits in a high seismic hazard area under the USGS National Seismic Hazard Model. Strong ground shaking is expected over a building’s life, and substantial seismic-resistant design is required by code.

What is the Seismic Design Category for Yolo County?

Around the county centre the ASCE 7-16 Seismic Design Category is D, assuming Site Class D. The category for a specific parcel depends on its soil.

Earthquake Risk in Yolo County, California: Seismic Hazard & Design Category (USGS)

Hazard level

High

Seismic Design Category

S_s (short period)

1.202 g

S₁ (1-second)

0.416 g

PGA

0.522 g

Values are for the county centroid (38.680, -121.903) at Site Class D, Risk Category II, ASCE 7-16. A specific parcel can differ, mostly because of soil.

What this means in Yolo County

Strong ground shaking is expected over a building’s life, and substantial seismic-resistant design is required by code.

Buildings here are designed to Seismic Design Category D, which is how U.S. codes classify earthquake demand on a site. It drives structural detailing, bracing and, in the higher categories, whether a site-specific ground-motion study is needed at all.

Check a specific address in Yolo County County-centre values are a starting point. The free lookup runs the model at your exact address.

Common next steps in a high hazard area

Anchor the heavy things. Tall furniture, water heaters and wall-mounted screens move first in shaking.
→ Anti-tip furniture straps and anchors
Know how to shut off the gas. The wrench belongs at the meter, not in a drawer indoors.
→ Non-sparking gas shut-off wrench
Keep water you did not have to think about. Mains can be out for days after a significant event.
→ Emergency water storage and kits

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