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Ch7 sec2

Earthquackes

TermDefinition
Fault A huge crack in the Earth's crust at or below the surface, sides of which may show evidence or motions.
Focus The point where an Earthquake starts as rocks begin to slide past each other.
Seismic Wave A vibration that spreads out away from a focus a focus when an earthquake happens.
Epicenter The point on Earth's surface directly above the focus of an earthquake.
Aftershock shaking of Earth's crust after the initial shaking of an earthquake.
Seismograph a sensitive device that detects the shaking of Earth's crust during an earthquake.
magnitude The amount of energy released in an earthquake.
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