Regular tsunamis are destructive, but mega tsunamis are on another level. Could one really reach skyscraper heights? How are they formed, and what would happen if the biggest one ever hit?

Tatsuki foresees a mega-tsunami in July 2025, triggered by underwater volcanic activity south of Japan. The impact zone includes Japan, Taiwan, Indonesia, and the Northern Mariana Islands ...

A magnitude 9 quake in 2011 that triggered a devastating tsunami and the triple reactor meltdowns at a nuclear power plant in northeast Japan killed more than 15,000 people.