Earthquake News

322 years without a 9.0 Cascadia Subduction Zone megaquake - and counting

ource: Katu

The next 9.0 mega quake on the Cascadia Subduction Zone?

Unfortunately, THAT we CAN imagine.



That earthquake on the Cascadia Subduction Zone in the year 1700 spawned a tsunami that devastated coastal areas of Japan across the Pacific Ocean.

The 600-mile-long fault line runs from northern California to British Columbia.


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Washington DNR Tsunami simulation for Pacific (DNR Video)


There have been over 40 earthquakes in the last 10,000 years along the Cascadia Subduction Zone fault.

Some have happened as few as 190 years apart; others as long as 1,200 years apart.

The last earthquake that occurred in this fault was on January 26, 1700, with an estimated 9.0 magnitude.


Animation shows the tsunami generated by the most 9.0 Cascadia Subduction Zone earthquake, which happened in January of the year 1700. (NOAA)





“Earthquake shaking may be so strong that running or crawling is not possible,” according to Oregon's Office of Emergency Management. “The safest action to take during an earthquake is drop, cover, and hold on.”

  • DROP where you are, onto your hands and knees – this position protects you from being knocked down and allows you to stay low and crawl to shelter if nearby. If no shelter is nearby, crawl next to an interior wall (away from windows).
  • COVER your head and neck with one arm and hand; if a sturdy table or desk is nearby, crawl under it and hold on with one hand. If there is no table or desk near you, maintain a crawling position to protect your vital organs and be ready to move if necessary.
  • HOLD ON until shaking stops. You are more likely to be injured if you try to move around during strong shaking.

Oregon encourages residents to be ready to last at least 2 weeks without support or supplies in the event of an earthquake.

You can learn more about becoming 2 Weeks Ready and even break the task down over the next year with the Eugene Water & Electric Board's Pledge to Prepare.

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