The Normal Fault
Are faults in which the hanging wall moves down relative to the footwall. This is caused by movement of the falut blocks away from each other. (tension type of stress)

The normal fault is not necessarily normal in the sense that it is common....because.... it is not the most common of faults. However what is normal about them is that their movement tends to follow the gravitational pull on the fault blocks involved.

The Reverse Fault
The reverse fault is a where the hanging wall moves up relative to the foot wall. This kind of fault is caused by movement of the fault blocks is toward each other(compression type of stress), not away from each other like in the normal fault.

Thrust Fault
Are usually found with areas of folded surfaces, like the Sinai Massif. These are very much like reverse faults, however the hanging wall has completly slid over and covers the footwall. (also caused by compression stress)

Strike-Slip Fault (Transverse)
Movement on a strike strip fault is horizontal, the blocks rub past each other. (caused by shear type of stress)

Probably the most well known and well studied fault of this type is known as the San Andreas fault of California. This fault is on the boundry between the Pacific and North American Plates. Actually anything crossing this fault zone is either slowly torn apart, or offset. These faults can be very long, the San Andreas is nearly 600 miles long

Rocks under STRESS.
Rocks along active plate boundaries are subjected to physical stress. They can experience squeezing (compression), stretching (tension), or pushing in different directions (shear stress). How rocks respond depends on the type of stress,how fast the stress is applied, and the environmental conditions of the rocks, such as their temperature and depth.
Generally, rocks respond to stress in one of two ways: they break, or they bend.
* When a rock breaks, it is called brittle deformation.
* When rocks bend or flow, like clay, it is called ductile deformation. What conditions do you think would be necessary for rocks to respond like clay?

Questions:

1.) Why would id be a bad idea to build your house near any fault?

2.) Explain the following terms: Compression stress, deformation, and tension stress.

3.) Which type of fault occurs when the rock layers are pulled or streatched?

4.) Explain the difference between a Thrust fault and a reverse fault.