Model of a Normal Fault
Grade Level: 4-12
A normal fault occurs when rocks break and move because they are being
pulled apart. As the area is stretched, the rocks move along the fault.
Each movement causes an earthquake. This model demonstrates how a block
of rock is extended by a normal fault.
- Photocopies of models
- Carefully cut out the larger block and construct, using glue where
indicated. Do not yet glue along the area marked "In this area
glue on the reverse side of this tab."
- Now cut out the smaller block and construct.
- Once the glue is dry, slide the flap of the larger block inside the
smaller block and then glue on the reserve of the tab indicated, so
that the two blocks are connected and yet the smaller block slides up
and down on the larger block.
- To see how a normal fault works, slide the smaller block up so that
the land surface is level. Measure the distance from one end of the
model to the other.
- Now cause the fault to move by sliding the smaller block downwards.
- Measure the length of the model. You will see that movement along
the normal fault has caused the area to become longer as it undergoes
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