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The original was posted on /r/todayilearned by /u/Kwpthrowaway2 on 2024-09-12 02:16:53+00:00.

Original Title: TIL that in 2023, a rockslide caused a megatsunami in Dickson fjord in eastern Greenland. The wave was 650 ft tall at the water entry point, and averaged over 200 ft along a 6 mile stretch of the fjord.