VOCABULARY Nº13

Fault: a huge crack in the crust, at or below the surface, the sides of which may show evidence of motion.





Focus: the point where an earth-quake starts, where rocks begin to slide past each other.





Seismic wave: a vibration that spreads out away from a focus when and earthquake happens.





Epicenter: the point on Earth's surface directly above the focus.





Seismograph: a sensitive device that detects the shaking of the crust.








Magnitude: the amount of energy released by an earthquake.