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FORCES, FAULTS AND FOLDS

|| Plate Tectonics || Geological Concepts || Faults and Folds 1 and 2 ||
|| Geological Detective || Rock Types || A Brief Geological History of the Southwest ||
 

Forces, ultimately from plate tectonics, act on rock and cause it to break (fault) or fold (fold).

FORCES:

tens2
comp2
shear
Tension: pulling apart 
Compression: pushing together 
Shear (Lateral): sliding past

FAULTS: when rocks break due to force. Put mouse cursor in image to see force applied to it.

n2
n1
ss1c
Normal Fault
Caused by tension
Reverse Fault
Caused by compression
Strike-Slip Fault
Caused by shear (lateral) forces

FOLDS: when rocks bend due to force. Put mouse cursor in image to see force applied to it.

ss1b
ss1

Anticline
Caused by compression
Folded up like an "A"

Syncline
Caused by compression
Folded down like a "U"

Now, are you ready to apply your new knowledge on the real thing?