The Good Friday Earthquake, aka The Great Alaskan Earthquake began at 5:36 P.M. AST on Good Friday, March 27, 1964. The epicenter was in Prince William Sound and produced massive tsunamis that reached Hawaii and US mainland coastlines and as far away as New Zealand, Japan and Antarctica to name a few.
This earthquake changed our understanding of Plate Tectonics and how mega-quakes are caused.