Tsunami Impact (IMAGE) Oregon State University Caption This graphic shows, in light blue, some of the areas that might be flooded near the mouth of the Columbia River during a tsunami caused by a major earthquake on the Cascadia Subduction Zone. Credit Oregon State University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.