Folding and Faulting

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Folding and Faulting

• Chapter 4, Sec. 4

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Stress

• Amount of force per area put on an object

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Rocks can change shape due to stress
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Three types of stress

• Compression
• Tension
• Shear

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FOLDING

• Rock layers bend due to stress
• Assume most rocks are laid down horizontal

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FAULTS

• The line along which rocks break and move

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Normal Faults

• Caused by tension forces
• Hanging wall moves down

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Reverse Faults

• Caused by compression forces
• Hanging wall moves up

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Strike-slip Faults

• Opposing forces cause rock to break
• Move horizontally

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