What is the strongest tsunami in history?

The tsunami that just hit Japan has been considered the strongest in RECORDED history. While it was not the most devastating, the epicenter (somewhere in the pacific) was powerful enough to affect the earth's orbit around the sun ever so slightly... that says large to me.

Answer#2

The highest tsunami apparently is the 1958 Lituya Bay(Alaska) mega-tsunami with a record height of 524 m (1742 ft).

In comparison the tsunami caused by the magnitude 9.0 earthquake that hit Japan reportedly struck a coastal city in Japan at just over 23 meters (77 feet) high and in many places up to 10 meters (33 feet).