The big landslike tsunamis in Alaska occured where the wave energy was channeled and focused inide of bays and straits.
In the wide open Atlantic, the energy from a landslide-created tsunami would spread out in 360*, rapidly dissipating its energy.
A single-point event like even a giant landslide would NOT be like the Indian Ocean Christmas tsunami, where the earthquake took place over 100s of miles, pushing up a huge linear tsunami. In that situation, the energy can’t dissipate in 360*, because the long wave reinforces itself or “holds itself up” across its length.
Anybody who conflates the Christmas earthquake tsunami with a single-point landslide tsunami is ignorant of the physics involved.
Good points; any thoughts on whether or not there would be any particularly nasty effects from that part of the wave that gets trapped inside the Gulf of Mexico, or any portions that would reflect off of the northern sides of South Africa and, perhaps via Cuba, end up trapped in the Gulf as well?