On This Day: Great Alaska Earthquake and Tsunami
www.ncei.noaa.gov
On March 27, 1964, without warning, the largest recorded earthquake in U.S. history struck Alaska’s Prince William Sound.

Alaska’s continental shelf and North American plate rose over 9 meters during the earthquake. This sudden displacement of the ocean floor, along with earthquake-induced landslides, generated massive local tsunamis that resulted in 70 percent of the fatalities in southern Alaska. The tsunamis created by the earthquake reached land within a few minutes of the ground shaking and engulfed some areas as much as 170 feet above sea level. Scientists measured a wave runup of 220 feet in the Valdez Inlet.

I learned it from reading this post:https://sh.itjust.works/post/14455184