Guided Waves
Guided Waves : Guided waves are trapped in a waveguide by total reflections or bending of rays at the top and bottom boundaries. An outstanding example is the acoustic waves in the SOFAR channel, a low-velocity channel in the ocean. Since the absorption coefficient for sound in seawater is quite small for frequencies on the order of a few 100 Hz, transoceanic transmission is easily achieved. If the Earth's surface is considered as the top of a waveguide, surface waves, such as Rayleigh, Love, and their higher modes, are guided waves. The fault-zone trapped mode is a guided wave in the low velocity fault zone. Where they can exist, guided waves may propagate to considerable distances, because they are effectively spreading in only two spatial dimensions
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