L19_SeismicRefractionII-page4

# L19_SeismicRefractionII-page4 - Determining velocity V 1 V...

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Applied Geophysics – Refraction II Separation of delay times Determining the delay time beneath a geophone, T D : Total traveltime ABFG: ' 2 S S t T T V L T + + = Total traveltime ABCD: D S SD T T V x T + + = 2 Total traveltime GFED: D S D S T T V x L T + + = ' 2 ' Adding the equations for T SD and T S’D and using the equation for T t we obtain an equation for T D : 2 ' t D S SD D T T T T + = Î determine T D from a reversed refraction line p lu s Applied Geophysics – Refraction II Separation of delay times
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Unformatted text preview: Determining velocity, V 1 V 2 : Direct arrival slope = 1/V 1 Subtracting the equations for T SD and T S’D we obtain the equation: ' 2 2 ' 2 S S D S SD T T V L V x T T ∆ − ∆ + − = − m i n u y = ax + b • Plotting (T SD- T S’D ) against x the slope is 2/V 2 • Variations in the slope reflect lateral variations in velocity...
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## This note was uploaded on 01/07/2012 for the course PHYSICS 384 taught by Professor Wei during the Spring '09 term at SUNY Stony Brook.

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