1 / 41

Understanding Dip and Strike in Lower Hemisphere Projections

Connect the dots and visualize stereonet projections to determine dip and strike in lower hemisphere. Rotate poles to strike line and read off dip angles. Explore different options and understand how things move in different geological scenarios.

patriciah
Download Presentation

Understanding Dip and Strike in Lower Hemisphere Projections

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 2 Option 1

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

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

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

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

  23. 2 strike options – which one for R.H.R.? CORRECT! Dip to Right Option 2 R L Option 1

  24. Read it off Option 2

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

  26. Read it off 0o 30o 330o ~298o Option 2 60o 300o 270o 90o 120o 240o 150o 210o 180o

  27. Striking 298o Dipping 77o

  28. You try the other plane

  29. Dipping ~39o

  30. Striking 0o 30o 330o 60o 300o 270o 90o 120o 240o 150o 210o 180o ~190o

  31. Striking 298o Dipping 77o Striking 190o 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”

More Related