How fast did the tsunami from the 2011 Japan earthquake travel across the Pacific Ocean?

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earthquake damage, Honshu, Japan, 2011 — Japan earthquake and tsunami of 2011 Aerial view of damage to a portion of the northeastern coast of Honshu, Japan, following the offshore earthquake and resultant tsunami there on March 11, 2011.

The tsunami generated by the 2011 Japan earthquake traveled across the Pacific Ocean at speeds that approached approximately 500 miles (800 km) per hour.1