FOCUS - The point inside the crust where the pressure is released., EPICENTRE - The point on the Earth's surface directly above where the pressure is released., SEISMIC WAVES - The spread of energy from the point where pressure is released. They are felt most strongly directly above this point and weaken with increased distance., RICHTER SCALE - The measurement of earthquake magnitude, ranging from 0 to 10, measured using a seismometer.,

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