An earthquake that occurs beneath the ocean can create can creat a giant wave ca

Question

An earthquake that occurs beneath the ocean can create can creat a giant wave called tsunami. A very large tsunami occured recently in the Indian Ocean. Typical tsunamis have very long wavelengths in the open ocean, about 200.0 km (about 125miles). They are almost undetectable in the open ocean as well, since their amplitudes range from only a few centimeters to one meter. A) Tsunamis travel very fast. A typical speed for a tsunami is 700.0 km/h. 1: what is the speed (in minutes) for a tsunami with this speed? 2: what is its frequency (in Hz)? B) Tsunamis also aren't just one large wave pulse that crashes on a shore. They are usually made up of a wave train several wavelengths long. What would be the time between two successive wave crests reaching shore? PLEASE SHOW ALL STEPS

Explanation / Answer

a)--1)700/60 = 11.66 Km/min -----2) frequency = speed / wavelength= 700 / 200 per hour =3.5 per hour= 9.72x10^-4 hz b)waves come at the shore at the end of each time period. the time period = 1/frequency = 1028 sec

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