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Be aware. Be prepared.

The last Cascadia Subduction Zone earthquake event—Magnitude 8.0 to 9.1—was January 26, 1700 (322 years ago), and it happens about every 280 to 350 years. It’s time to get ready.

When the Cascadia Earthquake occurs, services will be likely be interrupted for at least two weeks in Oregon, if not longer. Oregonians can take steps to get ready by planning and preparing yourself and your community.

ShakeAlert is the earthquake early warning system for Oregon, Washington, and California. It is operated by the United States Geological Survey. ShakeAlert detects an earthquake moments after it begins, so that alerts can be sent to people in the affected area. Because information travels faster than earthquake waves, alerts can reach people quickly before they even begin to feel shaking.

MyShake App: Download Here

QuakeAlertUSA App: Download Here

ShakeAlert Quick Facts: English

ShakeAlert FAQ: English, Spanish

From Oregon.gov:

Homes built before 1974, when Oregon adopted its first statewide building code, will suffer the worst damage in a serious earthquake.  Constructed to specific seismic standards, homes built after 1993 are the most likely to withstand earthquakes. Read this document if you’d like to learn more about Oregon’s seismic building code timeline.

 Earthquake forces can affect your home in three ways.

  • The house may slide off its foundation.
  • The cripple walls (walls between the foundation and floor) may buckle and collapse (this is called racking).
  • Your house may be lifted off its foundation.

Earthquakes can cause considerable damage to the structure and to utilities and services like water heaters and gas lines.

While there are many types of earthquake retrofitting, the two most common are bolting the house (mudsill) to the foundation and reinforcing the cripple walls with plywood sheathing. (Cripple walls are also called “pony” walls.)

Some older homes do not have cripple walls. There are still several methods available for improving the connection of the framing to the foundation when a house does not have cripple walls.

If a living space sits atop a garage or other open structure, that area may be particularly vulnerable to earthquakes. The garage or open structure (“soft story buildings”) may need additional bracing. Strapping water heaters is now required by code and new water heaters are generally secure. Older water heaters may need to be strapped to the wall studs. There are other items, like masonry chimneys, that may need to be considered in an earthquake retrofit.

You may choose to have an automatic shutoff valve installed on a gas line. Located between the gas meter and the house, the valve is activated by the shaking of an earthquake.

Below are some downloadable resources from the Oregon Office of Emergency Management. All resources can be found here: https://www.oregon.gov/oem/hazardsprep/Pages/default.aspx

Living on Shaky Ground: English, Spanish

Creating a Pocket Planner: English, Spanish

2 Weeks Ready – FOOD: English, Spanish

2 Weeks Ready – WATER: English, Spanish

2 Weeks Ready – SENIORS: English, Spanish

2 Weeks Ready – PETS: English, Spanish

2 Weeks Ready – NEIGHBORHOOD: English

Below are some downloadable resources from Oregon State University. More resources can be found here: https://extension.oregonstate.edu/cascadia-earthquake-preparedness

Cascadia Action Steps: English, Spanish

Water: English, Spanish

Food: English, Spanish

Emergency Kits: English, Spanish

Sanitation: English, Spanish

No Power, No Problem: English, Spanish

Without Warning Earthquake Comic: English, Spanish

Without Warning Tsunami Comic: English, Spanish

Rocket’s Earthquake Safety Adventure: English, Spanish

Rocket’s Earthquake Safety Activity Book: English, Spanish

ShakeAlert Activities: English, Spanish

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