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On LOWER hemisphere projections the arc bows in the dip direction

On LOWER hemisphere projections the arc bows in the dip direction. One plane at a time. One plane at a time. Connect the dots. Which way is the dip?. Which way is the dip?. What is the dip?. Visualize stereonet. Rotate poles to strike line. Rotate poles to strike line.

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On LOWER hemisphere projections the arc bows in the dip direction

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  1. On LOWER hemisphere projections the arc bows in the dip direction

  2. One plane at a time

  3. One plane at a time

  4. Connect the dots

  5. Which way is the dip?

  6. Which way is the dip?

  7. What is the dip?

  8. Visualize stereonet

  9. Rotate poles to strike line

  10. Rotate poles to strike line

  11. Rotate poles to strike line

  12. Rotate poles to strike line

  13. Rotate poles to strike line

  14. Read off dip

  15. Read off dip 0o 30o 60o 90o

  16. Read off dip 0o 30o 60o ~77o 90o

  17. 2 strike options – which one for R.H.R.? Option 1 Option 2

  18. 2 strike options – which one for R.H.R.? Option 1 Option 2

  19. 2 strike options – which one for R.H.R.? Option 1 L R Option 2

  20. 2 strike options – which one for R.H.R.? NO GOOD Option 1 L R Option 2

  21. 2 strike options – which one for R.H.R.? Option 1 R L Option 2

  22. 2 strike options – which one for R.H.R.? Option 1 CORRECT! R L Option 2

  23. What is the strike? Option 2

  24. Read it off Option 2

  25. Read it off 0o 30o 330o 60o 300o 270o 90o 120o 240o Option 2 150o 210o 180o

  26. Read it off 0o 30o 330o 60o 300o 270o 90o ~118o 120o 240o Option 2 150o 210o 180o

  27. Striking 118o Dipping 77o

  28. You try the other plane

  29. Dipping ~39o

  30. Striking 0o ~10o 30o 330o 60o 300o 270o 90o 120o 240o 150o 210o 180o

  31. Striking 118o Dipping 77o Striking 10o Dipping 39o

  32. On LOWER hemisphere projections the arc bows in the dip direction

  33. What about UPPER hemisphere?

  34. What about UPPER hemisphere?

  35. Arc flips to the other side – plane is dipping opposite the arc bow direction But strike is the same

  36. How do things move? Compression (Black) moves away

  37. Normal Reverse Map view

  38. Oblique (Normal) Strike-slip (left lateral) Map view

  39. More Fun at • http://demonstrations.wolfram.com/EarthquakeFocalMechanism/ • Might need to install their “player”

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