Earthquake: a movement or trembling of the ground that is caused by a sudden release od energy when rocks along a fault move.
Elastic rebound: the sudden return of elastically deformed rock to its undeformed shape.
Focus: the location within Earth along a fault at which the first motion of an earthquake occurs.
Epicenter: the point on Earth's surface directly above an earthquake;s starting point, or focus.
Seismology: is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies.
Seismograph: an instrument that records vibrations in the ground.
Seimmogram: a tracing of earthquake motion that is recorded by a seismograph.
Magnitude: a measure of the strength of an earthquake.
Intensity: in Earth science, the amount of damage caused by an earthquake.
Tsunami: a giant ocean wave that forms after a volcanic eruption, submarine earthquake, or landslide