1. This week: PS #1 due today at beginning of class PS #2 is on the website, due next Tuesday (use student account to print) www.geology.cwu.edu/facstaff/huerta/g360/ Reading: ch. 4- Strain (not 4.8) and Ch 5- Rheology of van der Pluijm Lab #3: Outcrop patterns, Ch 2 of RD&S This week: PS #1 due today at beginning of class PS #2 is on the website, due next Tuesday (use student account to print) www.geology.cwu.edu/facstaff/huerta/g360/ Reading: ch. 4- Strain (not 4.8) and Ch 5- Rheology of van der Pluijm Lab #3: Outcrop patterns, Ch 2 of RD&S

2. Terminology clarification: Differential stress: difference between maximum and minimum stress: =    –   Deviatoric stress: difference between mean stress and maximum stress (or minimum stress), which is the radius of the Mohr Circle: =      (See deveitis)deveitis These equations hold for systems where we only deal with    and  . This works in most real life cases, when the value of   does not affect the shear and normal stresses acting on faults and fractures. Terminology clarification: Differential stress: difference between maximum and minimum stress: =    –   Deviatoric stress: difference between mean stress and maximum stress (or minimum stress), which is the radius of the Mohr Circle: =      (See deveitis)deveitis These equations hold for systems where we only deal with    and  . This works in most real life cases, when the value of   does not affect the shear and normal stresses acting on faults and fractures.

8. Dilation

11. x y Principal Strain Axes

12. Finite strain vs. incremental strain

13. Coaxial strain Incremental principal strain axes are the same throughout strain history

14. Non-coaxial strain Incremental principal strain axes rotate throughout strain history

15. Quantifying strain Longitudinal Volumetric Angular

16. Strain States (a) General strain (b) Axially symmetric extension (c) Axially symmetric shortening (d) Plane strain (e) Simple shortening

17. Strain on the map