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Think of any section of coast as a straight line.
Think of waves originating from a point of origin (much like throwing a ripple into a pond)
The beach then is the tangent to a single point of each wave.
WHile the waves themselves appear straight, they are part of a circle whose arc is so small that it is not readily perceived. However, since it is indeed an arc; for each wave there is but a single point that is perpindicular to the wave.
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Why normal waves are different to tsunamis?
Normal ocean waves are a surface feature caused primarily by wind. Water beneath the surface is barely affected by what's going on at the surface. Tsunamis (often mistakenly called "tidal waves") are immense pressure waves caused by undersea earthquakes. Emerging from the epicenter of the quake, these waves propagate through the entire depth of the ocean and travel at close to 700 miles per hour. At sea, they are usually barely visible, but as soon as they approach shore, the shrinking depth of the water forces the pressure wave (and the water containing it) up to catastrophic heights.
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