Epicenter: The location where the seismic waves of an earthquake first appear on the surface, usually almost directly above the focus.
Fault: A crack running through rock that is the result of tectonic forces.
Focus: The underground location of the seismic event that causes an earthquake.
Modified Mercalli scale: A scale used to compare earthquakes based on the effects they cause.
Richter scale: A scale used to compare earthquakes based on the energy released by the earthquake.
Seismic waves: Classified as body waves or surface waves, vibrations in rock and soil that transfer the force of the earthquake from the focus into the surrounding area.
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