Megatsunamis, though not a technical term, refer to waves 100 meters in height or more. They are supposed to be caused by asteroid impacts, volcanic explosion or landslides but very few have been witnessed. The term megatsunami originates from a 1958 event in Lituya Bay, Alaska when a magnitude 7.9 earthquake caused a landslide of 30 million cubic meters of rock to plunge into the bay, creating a wave 1720 feet high.
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