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## Main Question or Discussion Point

I read that the speed of a tsunami is given by

c = sqrt(G * d)

where G is the gravitational constant 9.8 m/sec^2 and

d is ocean depth in meters.

How is this derived? I had always thought that wave speed was a constant depending only on the medium.

Also, is there some fundamental mechanical difference between a tsunami and a "normal" surface ocean wave?

c = sqrt(G * d)

where G is the gravitational constant 9.8 m/sec^2 and

d is ocean depth in meters.

How is this derived? I had always thought that wave speed was a constant depending only on the medium.

Also, is there some fundamental mechanical difference between a tsunami and a "normal" surface ocean wave?