1. Stress and Faults

2. Stress on Rocks Is the pressure applied to rocks
Causes the rocks to deform (change shape), break, and/or move
3 types:
Compression
Tension
Shear

3. 1. Compression Stress Squeezes rocks together
Occurs at convergent boundaries
Profile View:

4. 2. Tension Stress Pulls rocks apart Occurs at divergent boundaries
Profile View:

5. 3. Shear Stress Slides/grinds rocks past each other
Occurs at transform boundaries
Overhead View:

6. Faults
Caused by the application of stress which then causes the rock to move
3 types:
Normal Fault
Reverse Fault
Strike-Slip Fault

7. 1. Normal Fault

8. 1. Normal Fault Occurs with tension stress
Causes the footwall to move up & the hanging wall to move down
Profile (side) view:

9. 2. Reverse Fault

10. 2. Reverse Fault Occurs with compression stress
Causes the footwall to move down & the hanging wall to move up
Profile (side) view:

11. 3. Strike-Slip Fault

12. 3. Strike-Slip Fault Occurs with shear stress Causes horizontal motion
Overhead (top-down) view: