L18_SeismicRefractionI-page3

L18_SeismicRefractionI-page3 - co Where the direct and head...

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3 Applied Geophysics – Refraction I Horizontal interface Traveltime equations 1 V x T = 1 2 2 1 2 2 1 2 2 1 1 1 ' 2 tan 2 cos 2 V V V V h V x T V i h x i V h T T T T T c c BD DD SB + = + = + + = Direct wave: Head wave: T = ax + b slope: 1/V 2 intercept: gives h 1 Head wave Applied Geophysics – Refraction I Horizontal interface Crossover distance, x
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Unformatted text preview: co Where the direct and head wave cross. Their travel times are equal: Another approach to obtaining layer thickness 1 2 1 2 1 1 2 2 1 2 2 1 2 1 2 2 V V V V h x V V V V h V x V x co co co + = + =...
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