Understanding Snell's Law and Seismic Data Interpretation
Explore topics including Snell's Law, seismic data interpretation, critical angles, and refracted head waves with insightful images and explanations. Enhance your knowledge of these fundamental concepts in geophysics.
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Presentation Transcript
Northern Sh Shot-gather Seismic Data
Southern P- Shot-gather Seismic Data
At critical angle of incidence, angle of refraction = 90 degrees=angle of reflection P` critical angle V1,rho1 P`P V2,rho2
Pre- and Post-critical Rays x z V1 Critical distance V2> V1 V2 1 = V ( ) tan 1 1 = V 2 tan
One-layer Refracted Head Wave Xc =? Tc=? Critical distance=Xc x z V1 c c V2> V1 2x 3x 1x V2
One-layer Refracted Head Wave Xc =? Tc=? Critical distance=Xc x z V1 c z0 c V2> V1 2x 3x 1x V2 = + = 2 X x x x 1 2 1 c = 2 tan z r V X 0 c c r V z r V = + = 2 T 1 1 1 c 1 1 1 = 2 T 0 (9) cos V c 1 c
One-layer Refracted Head Wave Xc =? Tc=? Xc + 2x Critical distance=Xc x z V1 c z0 c V2> V1 2x 3x 1x V2 x z (10) + = + ( ) 2 T x x 2 0 cos V V 2 c 2 1 c
For an incident S wave \ / S P r S\ S\S/ i t \ \ S P t S\S\
Example: Three Possible Critical Angles 1 sin icS S V V = = S o 90 1 t 2 V V = = S 1 o sin 90 1 t icP P 2 V V = = S 1 o sin 90 r 1 i P 1
