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12 Cards in this Set

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  • Back
Epicenter
the point dirctly above the focus
Focus
the point beneath the surface were rocks break under stress and causes earthquakes
Seismograph
device that records ground movement caused seismic waves
P waves
Primary waves, compresses and expands the ground
S waves
secondary waves, move the ground up and down and side to side
Surface waves
when s and p waves reach earths surface, cause sever damage
Compression
the rocks crust pushes together
Tension
the rocks crust pull away from each other
shearing
the rock move horizontally angianst each other
Normal Fault
tension, hanging wall drops and foot wall moves up
Reverse Fault
compression, when the hanging wall moves up higher and the foot wall moves down low
Fold
a bend in the earths crust