Kenji Satake of the Japan National Institute of Advanced Industrial Science and Technology reconstructed the event and surmised on the resultant tsunami from computer models using digital bathymetric data obtained on cruises commissioned by the Japan Marine Science and Technology Center. Estimated were: volume of 3000 km3 and velocity range from 20 m/s to 100 m/sec. Calculated tsunami heights were 100 meters (328 feet) in north Oahu, but 30 meters (98 feet) on the opposite side of the island, Waikiki. Five hours after the slide, 10-40 meters hit the Pacific Northwest and 30-70 meters in California, and in eight hours, 5-10 meters on the Japanese coast. Satake indicated that the wave heights could well have been double those sizes in the Hawaii Islands. So, a noted scientist did write about the prospects of a mega-tsunami in the far field from a landslide.
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We know that earthquakes cause tsunamis. Can a tsunami in reverse trigger an earthquake?
How realistic is Avatar, the #1 box office movie at $2.8 billion? Or the #3 2014 Star Wars ($2.1 billion). #2 at $2.2 billion was Titanic, and that did happen. One thing about life. We just don't know what will happen.