The point on the ground directly above the focus of an earthquake - Epicentre, The real 'centre' of an earthquake - Focus, Waves of energy given out in an earthquake; it shakes everything - Seismic waves, An instrument for recording vibrations during an earthquake - Seismometer, The shaking of the Earth's crust caused by rock movement. - Earthquake, How much energy an earthquake gives out. - Magnitude, A scale measuring the energy given out in an earthquake. - Richter scale, Giant waves caused by earthquakes in the ocean floor. - Tsunami, Smaller earthquakes after the main earthquake. - Aftershocks,

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