Earthquakes

Earthquakes PowerPoint PPT Presentation


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What Happens at boundaries. When plate boundaries move, they create stress on crust. Stress can bend rock (fold) or when the stress gets to big, break rock (fault). A result of the breaking of the rock is an earthquake.Please write this at the top of your note paper.. Types of Stress. ShearingP

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Earthquakes

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1. Earthquakes Earth’s crust in motion

2. What Happens at boundaries When plate boundaries move, they create stress on crust. Stress can bend rock (fold) or when the stress gets to big, break rock (fault). A result of the breaking of the rock is an earthquake. Please write this at the top of your note paper.

3. Types of Stress Shearing Push in two opposite directions Tension Pull apart Compression Push against each other

4. Tension

5. Compression

6. Shearing

7. Kinds of Faults Strike-slip fault Stress = shearing Rocks on each side of fault slide past each other Normal fault Stress = tension Hanging wall slips downward past footwall Reverse fault Stress = compression Hanging wall gets pushed about footwall

8. Reverse Fault

9. Normal Fault

10. Strike slip fault

11. Strike Slip Fault

14. Folds Anticlines Fold in rock that bends upward into an arch Oldest layers under arch Synclines Fold in rock that bends downward into a bowl Oldest layers under bowl

15. Anticline example

16. Syncline example

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