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Faulting - the cause of earthquakes

A fault is a break in the Earth's surface along which movement occurs. We experience such movement as an earthquake. Forces in the Earth's crust (compression, tension, and shear) result in three main types of breaks near the surface. The type of force determines the type of fault. Use your fault model box to help you draw, describe, and understand each type of fault.

NORMAL FAULT:

Move your fault model so that point A is next to point B.

What type of force acts on rocks to cause a normal fault?   _____________   Hint: do you have to pull (tension) or push (compression) the two halves of the model apart.
 

Draw a side view of the fault box model Describe what a person on the surface would see.
 
 
 
 
 
 
 

REVERSE OR THRUST FAULT:

Move your fault model so that point C is next to point D.

What type of force acts on rocks to cause a reverse fault?   _____________  
   

Draw a side view of the fault box model Describe what a person on the surface would see.
 
 
 
 
 
 
 

LATERAL OR STRIKE-SLIP FAULT:

Move your fault model so that point E is next to point F.

What type of force acts on rocks to cause a lateral fault?   _____________  
   

Draw a top view of the fault box model Describe what a person on the surface would see.