[enigma825]

"" I think that depends on the size of the undersea event"

My recollection of the explanation is that undersea events are the result of plate tectonics and never shift more than dozens of feet, not thousands of feet, therefore they cannot cause waves of the 1700 foot variety."



This was a sizeable move. Initial reports say the Island of Sumatra moved 100 feet.

[oldcomputerguy]

"This was a sizable move. Initial reports say the Island of Sumatra moved 100 feet."

Yes, I read that too, but that move was lateral and I believe it is primarily the vertical movements that cause the tsunamis which is why they tend to be capped at lower levels of height but not breadth or depth.