![Picture](/uploads/2/6/4/1/26416053/1395476.jpg)
Earthquake: a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action
![Picture](/uploads/2/6/4/1/26416053/818669.jpg)
Elastic Rebound: The elastic rebound theory is an explanation for how energy is spread during earthquakes. 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.
![Picture](/uploads/2/6/4/1/26416053/732778.jpg)
Focus: The focus of an earthquake is the point beneath Earth's surface where rock breaks under stress and the plates shift and that is what causes the earthquake.
![Picture](/uploads/2/6/4/1/26416053/6922049.jpg)
Epicenter: A point, directly above the true center of disturbance, from which the shock waves of an earthquake apparently radiate.
![Picture](/uploads/2/6/4/1/26416053/2185811.jpg)
Seismology:the branch of science concerned with earthquakes and related phenomena.
![Picture](/uploads/2/6/4/1/26416053/7721947.jpg)
Seismograph:an instrument that measures and records details of earthquakes, such as force and duration
![Picture](/uploads/2/6/4/1/26416053/8458921.jpg)
Magnitude: a measure of the strength of an earthquake.
![Picture](/uploads/2/6/4/1/26416053/6631565.jpg)
Intensity: the amount of damage caused by an earthquake.
![Picture](/uploads/2/6/4/1/26416053/741835.jpg)
Tsunami: a giant ocean wave that forms after a volcanic eruption, submarine earthquake, or landslide.
![Picture](/uploads/2/6/4/1/26416053/4260931.jpg)
Seismic Gap: An area along a fault where relatively few earthquakes have occurred recently but where strong earthquakes are known to have occurred in the past.