1 / 24

Geology 3120 - Faults

Geology 3120 - Faults. Outline. Fault components Slip verses separation Faulting styles Piercing points Calculating slip from piercing points Fault exercises. Kobe Earthquake Fault Rupture Museum. Fault Components. Footwall Hanging wall Fault plane, fault surface.

colby
Download Presentation

Geology 3120 - Faults

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. Geology 3120 - Faults

  2. Outline • Fault components • Slip verses separation • Faulting styles • Piercing points • Calculating slip from piercing points • Fault exercises

  3. Kobe Earthquake Fault Rupture Museum

  4. Fault Components • Footwall • Hanging wall • Fault plane, fault surface Hanging wall Footwall

  5. Slip verses Separation Separation Slip Pre-faulted block Faulted block Eroded block • Slip- actual relative displacement between two points that occupied the same location before faulting • Separation -apparent relative displacement between two points that may have occupied the same location before faulting

  6. Faulting Styles Normal Dip-slip Thrust Dip-slip Strike-slip Strike-slip

  7. Faulting Styles Oblique-slip: a combination of dip-slip and strike-slip

  8. Fault Exercises - Example ?? ?? Pre-faulted block Faulted block Eroded block

  9. Fault Exercises - Example ?? Pre-faulted block Faulted block Eroded block

  10. Fault Exercises - Example Pre-faulted block Faulted block Eroded block

  11. Fault Exercises • Study the examples in ia, ib, ic • Fill in the beds in the remaining six diagrams keeping in mind the effects faulting and erosion

  12. Example 2 ?? ?? Pre-faulted block Faulted block Eroded block

  13. Example 2 ?? Pre-faulted block Faulted block Eroded block

  14. Example 2 Pre-faulted block Faulted block Eroded block

  15. Example 3 ?? ?? Pre-faulted block Faulted block Eroded block

  16. Example 3 ?? Pre-faulted block Faulted block Eroded block

  17. Example 3 Pre-faulted block Faulted block Eroded block

  18. Example 4 ?? ?? Pre-faulted block Faulted block Eroded block

  19. Example 4 ?? Pre-faulted block Faulted block Eroded block

  20. Example 4 Pre-faulted block Faulted block Eroded block

  21. Piercing Points

  22. Calculating Slip Given: Position coordinates (x,y,z) in meters A (2, 3, 10) B (7,11, 3) Problem: Determine slip (trend, plunge, magnitude) A B

  23. Calculating Slip N Trend DX = (7-2) = 5 m DY = (11-3) = 8 m M = (DX2+ DY2)0.5 = (52+82)0.5 = 9.4 m Magnitude = 9.4 m Tan Q = DY/ DX Q = Tan-1(8/5) Q = 58° Azimuth = 90°-58° = 032° y A (2, 3, 10) B (7,11, 3) B M DY Q DX A 0 x

  24. Calculating Slip SW NE Plunge M = 9.4 m DZ = (10-3) = 7 m S = (M2+ DZ2)0.5 = (9.42+72)0.5 = 11.7 m Total slip [S] = 11.7 m Tan f = DZ/ M f = Tan-1(7/9.4) f = 37° Plunge value = 37° Solution: slip vector 37°,032°; 11.7 m magnitude z A M f DZ S B 0 x

More Related