This is a visual comparison of known tsunami wave heights, culminating with the Lituya Bay, Alaska mega tsunami that measured over 520m (1,700+ feet) high. Holy smokes! That particular tsunami was caused by a 7.8 magnitude earthquake that triggered a rockslide, quickly depositing some 90-million tons of rock into Lituya Bay, with the sudden displacement of water causing the 120MPH mega tsunami. That is absolutely terrifying. For reference, I don’t even like going into the wave pools at water parks. And not because I’m afraid of them, but because there’s never not at least a handful of little kid turds bobbing around like apples. I hate it and I want my money back.