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SOEE2102 – Geophysical Field Trip and Tutorials

SOEE2102 – Geophysical Field Trip and Tutorials. Malham Tarn (North Yorkshire) October 2009. Refraction Analysis. Sebastian Rost University of Leeds 2009. Traveltime Curves. Traveltime Curves. Traveltime Curves. Peaceful Nuclear Explosions. Traveltime Curves.

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SOEE2102 – Geophysical Field Trip and Tutorials

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  1. SOEE2102 – Geophysical Field Trip and Tutorials Malham Tarn (North Yorkshire) October 2009 Refraction Analysis Sebastian Rost University of Leeds 2009

  2. Traveltime Curves

  3. Traveltime Curves

  4. Traveltime Curves

  5. Peaceful Nuclear Explosions

  6. Traveltime Curves

  7. At criticaldistance: r = 90  ic = critical angle

  8. Seismic Wavefield and Seismic Raypaths Courtesy of M. Thorne (Univ. Utah)

  9. x Traveltimes Direct wave: (from velocity = distance / time )

  10. Refracted Wave: Snell’s Law

  11. Different ways to express the refracted traveltime curve Intercept time

  12. Crossover distance: Tdirect = Trefracted Xcross > 2z

  13. Intercept Times q1c q1 q2

  14. General multi-layer formula Layer thickness: z Layer velocity: V

  15. Up-Dip Q Down-Dip Q

  16. Combining Up-Dip and Down-Dip shoots with and Vd and Vu are apparent velocities!

  17. Field Experiment

  18. Shot point geometries 12 element geophone spread Possible shot point locations

  19. Off end reverse shot

  20. Sat On end Forward

  21. Sat On end reverse

  22. Traveltime picks (from Claritas)

  23. Traveltime Curves

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