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
flagItaly
0%
7%
15%
76%
13
flagthe Netherlands
0%
0%
25%
75%
12
flagAustralia
10%
10%
7%
71%
28
flagGreece
5%
10%
21%
63%
19
flagRepublic of Ireland
0%
0%
50%
50%
12
flagGermany
0%
17%
31%
48%
35
flagCanada
0%
9%
45%
45%
11
flagPoland
3%
20%
36%
39%
1515
flagthe United States
9%
19%
31%
39%
66
flagthe United Kingdom
4%
24%
42%
27%
70
flagIndia
5%
32%
35%
26%
34