Question

What will happened to the wavelength and the amplitude of tsunami as it reaches the shore...

My initial answer is increasing in amplitude and decreasing in wavelength, is it correct?

(edited) And what happened to the wave speed?

Answer 1

Wavelength doesnt change unless it changes medium.

Amplitude decease because of water friction.

Answer 2

@oOKawaiiOo it said that the initial amplitude was about fifty centimeters and the wavelength is hundreds of kilometers, if the amplitude decrease, would that still make sense, does depth of water affect the wavelength, because as it reaches the shore, the depth decreases.

Thanks for your help (:

Answer 3

typically for waves approaching a shore the wavelength decreases and the amplitude increase as the water becomes shallows and the wave "feel" the bottom. Eventually the waves become so steep that they break.

For a tsunami the first sign of an approaching wave however is a receding of the water at the shoreline. This was recorded very dramatically for the Indonesian tsunami that struck India a few years ago.

Answer 4

Thank you gleem! (: