L18_SeismicRefractionI-page4

L18_SeismicRefractionI-page4 - 3 2 1 1 2 2 1 1 1 tan 2 tan...

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4 Applied Geophysics – Refraction I Horizontal interface Reflections The critical reflection is the closest head wave arrival. At shorter offsets there are low amplitude reflections (used in reflection seismology). At greater offsets there are wide-angle reflections. Applied Geophysics – Refraction I Three-layer model 1 2 3 2 1 V DG V CD V BC V AB V SA T SG + + + + = Traveltime
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Unformatted text preview: 3 2 1 1 2 2 1 1 1 tan 2 tan 2 cos 2 cos 2 V z z x V z V z T c c SG θ − − + + = 2 3 2 2 2 3 2 1 3 2 1 2 3 1 3 2 2 V V V V z V V V V z V x T SG − + − + = With some manipulation 1. Determine V 1 , V 2 , V 3 from slopes 2. Determine z 1 from 1 st intercept 3. Determine z 2 from 2 nd intercept...
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