L19_SeismicRefractionII-page2 - unacceptable Special...

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Applied Geophysics – Refraction II Real Earth “flat” layers Although the interfaces between real Earth layers are not perfectly flat, head waves still travel along them Analysis methods: Best-fit straight line through the points provides some kind of average layer thickness and velocity though the error may be
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Unformatted text preview: unacceptable Special analysis techniques: Phantom arrivals Delay time Plus-minus Applied Geophysics – Refraction II Phantom arrivals Undulating surface • Cannot extrapolate the head wave arrival time curve back to the intercept • How do we determine layer thickness beneath the shot, S?...
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