Earthquake: It is a sudden release of energy in the Earth's crust that creates seismic waves.
Elastic Rebound: It is an explanation for how energy is spread during an earthquake. As rocks on opposite sides of a fault are subjected to force and shift, they accumulate energy and slowly deform until their internal strength is exceeded. At that time, a sudden movement occurs along the fault, releasing the accumulated energy, and the rocks snap back to their original under formed shape.
Focus: The focus of an earthquake is the place in the earth where the earthquake busted or the fault movement really took place.
Epicenter: It is the point on the Earth's surface that is directly above the focus.
Seismology: It is the scientific study of earthquakes and seismic waves that move through and around the Earth.
Seismograph: They are instruments that are used to measure the movement of the ground.
Magnitude: It is a measure of the amount of energy released during an earthquake.
Intensity: It is a number describing the severity of an earthquake in terms of its effects on the earth's surface and on humans and their structures.
Tsunami: They are waves caused by the disturbance of an earthquake in the ocean.
Seismic Gap: It is a segment of an active fault known to produce significant earthquakes, that has not slipped in an unusually long time when compared with other segments along the same structure.