L12_WavesAndRays-page10

L12_WavesAndRays-page10 - Head wave Occurs due to a low to...

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Applied Geophysics – Waves and rays - I Critical incidence when V 2 > V 1 , r P > i P therefore, we can increase i P until r P = 90° When r P = 90° i P = i C the critical angle 2 1 sin sin P P P P V r V i = 2 1 sin P P C V V i = The critically refracted energy travels along the velocity interface at V 2 continually refracting energy back into the upper medium at an angle i C Î a head wave Applied Geophysics – Waves and rays - I
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Unformatted text preview: Head wave Occurs due to a low to high velocity interface Energy travels along the boundary at the higher velocity Energy is continually refracted back into the upper medium at an angle i C Provides constraints on the boundary depth e.g. Moho depth...
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