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L18_SeismicRefractionI-page8

L18_SeismicRefractionI-page8 - i h h x i V h h T c d u c d...

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8 Applied Geophysics – Refraction I Reversing lines For horizontal layers the traveltime curves are symmetrical For dipping layers layer velocities appear different for each end – the dip and true velocity can be determined from the up- dip and down-dip velocities …shooting to a line of geophones from both ends Applied Geophysics – Refraction I Dipping layer traveltime Down-dip 1 2 1 ' V DS V CD V SC T d + + = [ ] 2 1 tan ) ( cos V
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Unformatted text preview: i h h x i V h h T c d u c d u d + − + + = With trigonometric transformations, an exercise for the class: Down-dip traveltime 1 1 cos 2 ) sin( V i h V i x T c d c d + + = φ Up-dip traveltime 1 1 cos 2 ) sin( V i h V i x T c u c u + − = …where is V 2 dependence? ) sin( 1 + = c d i V V Down-dip apparent velocity ) sin( 1 − = c u i V V Up-dip apparent velocity...
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