The latest scientific data seem to suggest a tsunami from one to seven feet striking Hawaii. But you never know, for the 8.5 Chile earthquake of 1922 caused havoc in Hilo Harbor, and 8.8 is three times more powerful.
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If there is a mega landslide of sufficient size and velocity falling into a deep ocean, the tsunami can be as high as 1000 meters, depending on who you ask.
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