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