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.
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A tsunami is a very long wave, so although it might be very tall, that will be normally seen as a very gradual increase in water height. In the open ocean a tsunami is imperceptible to shipping. When it reaches shore the front of the wave slows down and gains height. The real danger is that rather than breaking, a tsunami will keep on coming until after the peak of the wave hits shore, which might be hundreds of metres. And then of course they retreat hundreds of metres back out to sea laden with all the stuff they’ve just smashed up.
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