Cascadia subduction zone ruptured 314 years ago; mega earthquake & tsunami hit on Jan. 26, 1700

Click on photo to find out more about the interactive tsunami evacuation maps and smartphone and iPhone apps available for the Pacific Northwest.

Maybe it was the excitement over the Seahawks going to the Superbowl (just kidding), but we overlooked an important observance this weekend: the 314th anniversary of the (estimated) magnitude 9.0 megathrust earthquake and tsunami that occurred on the Cascadia Subduction Zone off the coastline of Washington, Oregon, Northern California, and British Columbia.

A magnitude 9.0 earthquake on the Cascadia fault would be one thousand times more powerful than the 2001 magnitude 6.8 Nisqually, Washington earthquake. The impacts on coastal communities would be similar to the earthquakes that struck Japan in March 2011 and Chile in February 2010.

Cascadia Region Earthquake Workgroup (CREW) has developed a number of free products to help Cascadia residents, schools, businesses, and emergency managers become better prepared for future earthquakes. CREW’s disaster planning toolkits for small businesses, post-disaster recovery guides, and other preparedness materials are available online at

Additional resources are the interactive tsunami evacuation maps of the Pacific Northwest developed by DNR and the Oregon Department of Geology and Mineral Industries. Those maps are tied into a web portal and apps for Android and iPhone (developed by Northwest Association of Networked Ocean Observing Systems).

More information is available about the free TsunamiEvac-NW app and Web portal.

Because it houses the Washington State Geologist, DNR provides education and technical assistance to citizens, industry and government on geologic hazards, including tsunami risks.

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