Spreading 2
Spreading 2 : When reference is made to tsunami waves, it is the scattering and dispersion 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, p[rimarily, but geographical spreading is very important also, depending on the tsunami source region, the orientation of the tsunami generating area, the source dimensions, and the geometry of the system
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