Why Prepare for a Cascadia Subduction Zone (CSZ) Earthquake?

Preparing for a CSZ Earthquake also prepares us for most other types of disaster. In addition to physical preparation (water, food, sanitation, etc.), a person becomes better mentally prepared to deal with uncertainty and stressful situations.

What is the Cascadia Subduction Zone and when will there be an earthquake?

The Cascadia Subduction Zone is an offshore 700-mile fault that runs from Vancouver Island to Northern California. During the past 10,000 years, the fault has produced 43 major earthquakes ranging up to magnitude 9.0+. These earthquakes have happened on average every 243 years.

On January 26th, 2025, we observed the 325th anniversary of the last major earthquake that occurred on January 26th, 1700. Scientists estimate a 37% chance of a magnitude 7.1 or larger earthquake occurring in the next 50 years.

Here are two sources of additional information about the CSZ:

Potential Impacts

While it is impossible to predict when a CSZ earthquake will happen, it is possible, to some degree, know how the earthquake will disrupt routine life. Download this trif-fold which describes the potential effects of CSZ in the Portland metro area.

Household Preparedness

As mentioned earlier, preparing for the earthquake will prepare you for most other emergencies, including winter storms and heat domes. Download this tri-fold which provides an overview of preparing your household for a wide range emergency situations.

Neighborhood Preparedness

As you prepare your household, it will become apparent that you have skills or resources that might be important to share with your neighbors. Or, you may need some form of assistance. Download this tri-fold which describes how to organize your neighbors into a cohesive group ready to support each other for emergencies large or small.

Page updated

Report abuse