forces i nside earth
Post on 23-Feb-2016
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Forces Inside Earth
Fault Formation elastic limit= how far a rock will bend and
stretch Elastic deformation= forces that cause
rocks to bend and stretch out of shape Faults= when rocks are bent and
stretched beyond the limit and break and move along surface can move up, down, or sideways
Motion along Faults Causes Earthquakes
As rocks along a fault move, they catch on each other.
This causes rocks to stop moving, and stress builds up.
Rocks bend and stretch beyond elastic limit, they break, move along fault, and return to original shapes. An earthquake results from vibrations caused when rocks break.
3 Types of Forces
3 Types of Force Tension pulls rocks apart
3 Types of Force Compression squeezes rock together
3 Types of Force Shear Causes rocks on either side of the
fault to slide past each other
3 Types of Faults
3 Types of Faults
tension force pulls apart rocks Rocks above the fault surface moves downward
Normal
3 Types of Faults
compression squeezes rocks Rocks above the fault surface moves up &
over
Reverse
3 Types of Faults
Shear forces slide past without moving up or down
Rocks slide past each other in different directions
Strike-slip
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