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