all images USGS)
A fault is a large crack in the Earth’s crust where one part of the crust has moved against anot
her part. This movement means that faults prove the Earth is an active place. They are signs of powerful forces deep underground.. Where the fault plane is sloping, the lower side is the hanging wall and the upper side is the footwall. When the fault plane is vertical, there is no hanging wall or footwall.
It’s important to know a fault’s type: normal, reverse or strike-slip. The type reflects the kind of forces that are acting on the fault.
Normal faults form when the hanging wall drops down. The stress that creates normal faults are pulling the sides apart, or extensional (TENSION).
Reverse faults form when the hanging wall moves up. The stress that creates reverse faults are compressional (COMPRESSION), pushing the sides together.
Strike-slip faults have walls that move sideways, not up or down. That is, the slip occurs along the strike, not up or down the dip. In these faults the fault plane is usually vertical, so there is no hanging wall or footwall. The stress creating these faults are SHEARING, carrying the sides past each other
For this project, you are to make a 3D model of the picture. Your project should be
- be MOVABLE…
- The preferred material are styrofoam or wood blocks
- In your model you should be able to move your model to create the 3 types of faults
- In your model you should include a painted/glued on crops/forest, fence, road, river, and railroad track.
- Label and color the layers of different rock onto your model
- The movement of the fault should show effects on the above objects
LEAVE A COMMENT..Students leave a comment and share your experience building your faults!