EARTHQUAKES
Earthquake: a movement of the ground that is caused by a sudden release of energy when rocks along a fault line move.
Elastic Rebound: the sudden return of elastically deformed rock to its undeformed shape
Epicenter: the point on Earth's surface directly above an earthquakes starting point
Seismology: study of earthquakes
Seismograph: an instrument that records vibrations in the ground
Magnitude: a measure of the strength of an earthquake
Intensity: the amount of damage caused by an earthquake
Tsunami: submarine earthquake
Seismic Gap: an area along a fault where few earthquakes have occurred but where strong earthquakes are known to have occurred in the past