Folding and Faulting Chapter 4, Sec. 4
Amount of force per area put on an object Stress Amount of force per area put on an object
Rocks can change shape due to stress
Three types of stress: Compression Tension Shear
FOLDING Rock layers bend due to stress Assume most rocks are laid down horizontal
The line along which rocks break and move FAULTS The line along which rocks break and move
Caused by tension forces Hanging wall moves down Normal Faults Caused by tension forces Hanging wall moves down
Reverse Faults Caused by compression forces Hanging wall moves up
Opposing forces cause rock to break Strike-slip Faults Opposing forces cause rock to break Move horizontally