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Reflection Seismology: Mid-point Coordinates and Rock Interfaces

Learn about reflection coefficients, multiple layers, Snell’s Law, and Dix’s Formula in reflection seismology. Understand how to calculate RMS velocity and true velocity with common equations.

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Reflection Seismology: Mid-point Coordinates and Rock Interfaces

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  1. Reflection Seismology

  2. Common Mid-point Coordinates g m s h m= (s+g)/2 h= (s-g)/2

  3. h h z

  4. Reflection Coefficents Rock-rock interface v1=2500 m/s v2=3000 m/s R= 0.2 Sea-bottom Water-rock interface V1=1500 m/s v2=2500 m/s D1=1000 D2=2600 R= 0.7 Free Surface R= -1.0

  5. A= -0.49 A= 0.2 Multiples Multiple Primary

  6. Multiple layers - RMS velocity

  7. Constant velocity approx x Snell’s Law

  8. Dix’s Formula – RMS to true velcoity RMS velocity definition

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