1. 27 June 2015GLG510 Advanced Structural Geology Faults and stress

2. 27 June 2015GLG510 Advanced Structural Geology Relationship between traction and stress

3. 27 June 2015GLG510 Advanced Structural Geology  xx  yy  yx =  yx 11 33

4. 27 June 2015GLG510 Advanced Structural Geology

5. 27 June 2015GLG510 Advanced Structural Geology

6. 27 June 2015GLG510 Advanced Structural Geology

7. 27 June 2015GLG510 Advanced Structural Geology Faults and stress: traction and stress Mohr Circle Graphical construction that lets us visualize the relationship between the principal stresses and tractions on a boundary (like a fault).  measured positive clockwise from  1 direction clockwise to plane of interest 2  measure positive clockwise from –  n direction on Mohr circle

8. 27 June 2015GLG510 Advanced Structural Geology Faults and stress: traction and stress Equations of the Mohr Circle (also “Cauchy’s equations”)

9. 27 June 2015GLG510 Advanced Structural Geology 90 Faults and stress: traction and stress

10. 27 June 2015GLG510 Advanced Structural Geology Faults and stress: traction and stress

11. 27 June 2015GLG510 Advanced Structural Geology Faults and stress: traction and stress

12. 27 June 2015GLG510 Advanced Structural Geology Faults and stress: traction and stress

13. 27 June 2015GLG510 Advanced Structural Geology 35 Faults and stress: traction and stress

14. 27 June 2015GLG510 Advanced Structural Geology  =  s -Davis and Reynolds Faults and stress: traction and stress

15. 27 June 2015GLG510 Advanced Structural Geology -Engelder, 1993, Stress regimes in the lithosphere, Princeton Univ. Press

16. 27 June 2015GLG510 Advanced Structural Geology Pollard and Fletcher

17. 27 June 2015GLG510 Advanced Structural Geology Coulomb Law of Failure Coulomb equation  c = c + tan   n Where  c = critical shear stress required for faulting (shear strength) c = cohesive strength tan  = coefficient of internal friction = 

18. 27 June 2015GLG510 Advanced Structural Geology

19. 27 June 2015GLG510 Advanced Structural Geology Faults and stress: traction and stress

20. 27 June 2015GLG510 Advanced Structural Geology -D+R

21. 27 June 2015GLG510 Advanced Structural Geology

22. 27 June 2015GLG510 Advanced Structural Geology

23. 27 June 2015GLG510 Advanced Structural Geology Practice

24. 27 June 2015GLG510 Advanced Structural Geology