L20_SeismicRefractionIII-page2

L20_SeismicRefractionIII-page2 - Generalized reciprocal...

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Applied Geophysics – Refraction III Generalized reciprocal method Define two functions: 1.Velocity analysis function, T V 2 AB BX AY V T T T T + = This is the traveltime from A to H 2.Time-depth function, T G ( ) 2 ' V XY T T T T AB BX AY G + = This is the traveltime along EX or FY minus the traveltime of the projection of GX or GY along the refractor interface i.e. the traveltime along the GH V’ is the apparent refractor velocity determined from T V Applied Geophysics – Refraction III
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Unformatted text preview: Generalized reciprocal method Procedure: Velocity analysis function, T V • Calculate T V as a function of offset AG for a variety of XY distances • The optimal XY is when E and F converge on H • Optimal XY is identified by the smoothest T V curve • Refractor velocity V’ is the reciprocal of the slope of T V • Can determine variations in V’ along the length of the profile T V Offset AG...
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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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