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|User Info||El Hierro Eruption Imminent; entered at 2011-10-10 18:34:18|
Registered: 2007-08-26 East Tennessee Eastern Time
Lituya bay was special circumstances. The highest a tsunami can be in open ocean is 100-150 feet. Of course that height increases as the sea floor slopes up, but that's as big as it gets open ocean.|
Lituya bay was so high because it was a long narrow bay.
Now you could get a massive tsunami (100+ ft) that channels straight into a bay like that and get destruction 1000+ ft up, but it would take very special circumstances to cause it.