Spreading 3
Spreading 3 : When reference is made to tsunami waves, it is the spreading of the wave energy over a wider geographical area as the waves propagate away from the source region. The reason for this geographical spreading and reduction of wave energy with distance traveled, is the sphericity of the earth. The tsunami energy will begin converging again at a distance of 90 degrees from the source. Of course tsunami waves propagating across a large ocean undergo other changes in energy configuration due to refraction, primarily, but geographical spreading is also very important depending upon the orientation, dimensions and geometry of the tsunami source
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