There are videos like this: [Ice drop tsunami](https://m.youtube.com/watch?v=jX2mtToygPw)
And if I remember correctly, there’s a bay in Alaska where this happens semi regularly and sends waves 500 feet up the sides of the mountains across the bay.
https://earthobservatory.nasa.gov/images/147557/lituya-bays-apocalyptic-wave#:~:text=One%20of%20the%20causes%20of,cliff%20and%20dropped%202%2C000%20feet.
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