Which one of the following is true of most tsunamis?

A) They are faster than seismic surface waves.
B) Their wave heights decrease and wavelengths increase as they move into shallower water.
C) They are usually started by sudden movement on a megathrust fault, and they have wavelengths that are many kilometers long and wave heights of less than a meter.
D) They only occur in the Pacific Ocean basin.


Answer: C

Environmental & Atmospheric Sciences

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