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 have wavelengths that are many kilometers long and wave heights of less than a meter.
D)They only occur in the Pacific Ocean basin.

Question

Quizplus · Accepted Answer

Tsunamis are typically caused by sudden movements on megathrust faults, which are associated with tectonic plate boundaries. These movements displace large volumes of water, generating waves with long wavelengths (often many kilometers) and initially small wave heights (usually less than a meter in the open ocean). As tsunamis approach shallower coastal waters, their wave heights increase due to the decrease in water depth, which forces the wave to grow taller.

Which One of the Following Is True of Most Tsunamis