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 earthquake starts, where rocks begin to slide past each other.
seismic waves: a vibriation that spreads out away from a focus when am earthquake happens.
epicenter: the point on Earth surface directly above the focus.
aftershock: the shaking of the crust after the initial shaking of an earthquake.
seismograph: a sensitive divice that detect the shaking of the crust.
magnitude: the amount of energy released by an earthquake.
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