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Faults and Stress
Unit 2 Lesson 2
Faults Fractures in the earth occur when a force is
applied to the underlying rock, which movement occurs.
Stress is the force per unit area acting upon a material.
There are 3 types of stress that acts upon the Earth’s rocks: Compression: decreases material volume Tension: pulls the material apart Shear: Causes the material to slip or twist
Types of Faults Slip Faults
Horizontal tension Sideways movement
Normal Fault Tension (Apart)
Down on advancing block
Thrust/Reverse Fault Compression
Uplift of advancing block
Examples of Faults Reverse Fault
Note the compression Note the uplift
San Andreas Fault Pulled apart Sideways movement