How fast do tsunami waves travel across the open ocean?

about 20 km/h
about 100 km/h
up to 300 km/h
up to 800 km/h
Where the ocean is over 6,000 meters (3.7 miles) deep, unnoticed tsunami waves can travel at the speed of a commercial jet plane, over 800 km per hour (500 miles per hour). Tsunamis travel much slower in shallower coastal waters where their wave heights begin to increase dramatically.
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Answers by country

about 20 km/h
about 100 km/h
up to 300 km/h
up to 800 km/h
answers
flagAustralia
9%
9%
0%
81%
11
flagPoland
5%
27%
30%
36%
425
flagthe United Kingdom
0%
28%
42%
28%
14
flagthe United States
16%
25%
50%
8%
12