Any tsunami video I look at barely looks like a 20 feet wave hitting shore. But wikipedia tells me there have been dozens of 100+ feet tsunamis even in the last 10 years.
Tsunamis aren’t usually large waves like you see surfers ride, they are usually just large surges of water. There are plenty of videos of the 2011 Tohoku Tsunami in Japan which reached over 100 feet, you can see what that looks like.
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