1. GLG310 Structural Geology
Welcome to our class. This is GLG310 and I am Ramon Arrowsmith.
GLG310 Structural Geology

2. GLG310 Structural Geology
Today’s plan
Continue Force, Stress, and Strength (Chapter 3) [continue reading Chapter 3]
Be sure to cross reference the lecture and the textbook
Stretch a bit into faults and stress
17 April 2017
GLG310 Structural Geology

3. Classification of faults
17 April 2017

4. GLG310 Structural Geology
Fracture
17 April 2017
GLG310 Structural Geology

5. Andersonian Faulting Theory
Key assumptions:
Earth’s surface is a free surface (so it has no shear tractions acting along it). Therefore, s1, s2, s3 must be either parallel or perpendicular to it.
A fault will slip in the direction of maximum resolved shear traction
17 April 2017

6. By E. M. Anderson
(1st ed. 1942, 2nd ed. 1951)

7. Andersonian Faulting Theory

8. Andersonian Faulting Theory
Rowland and Duebendorfer
17 April 2017
GLG510 Advanced Structural Geology

9. Andersonian Faulting Theory

10. -Engelder, 1993, Stress regimes in the lithosphere, Princeton Univ
-Engelder, 1993, Stress regimes in the lithosphere, Princeton Univ. Press

11. GLG310 Structural Geology
Relative stress magnitudes and faulting regimes
(from Reservoir Geomechanics by Zoback--
17 April 2017
GLG310 Structural Geology

12. 17 April 2017

14. World Stress Map
17 April 2017

15. North America Stress Map
North America Stress Map