Tsunamis are deep ocean waves that usually result from the undersea earthquakes

Question

Tsunamis are deep ocean waves that usually result from the undersea earthquakes or landslides. The historic tsunami that struck the Hilo side of the Big Island on April 1, 1946 orginated from an undersea earthquake in the Aleutian Islands of Alaska, 3700km away. Suppose that it took 4.1 hours for the tsunami to reach Hawaii. (Assume constant speed.) As it washed past Hawaii, people noticed that crests arrived 15 minutes apart. What is the tsunami's wavelength (while traveling in deep open water)?

Explanation / Answer

wavelength=distance between crests=15*60*v ....v=velocity of waves =3700000/(4.1*60*60)=250.678 m/s

or wavelenth=15*60*275.678=225.61 km

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