EARTHQUAKE - a sudden and violent shaking of the ground, sometimes causing great destruction
ELASTIC REBOUND - an explanation for how energy is spread during earthquakes.
FOCUS - a central point, as of attraction, attention, or activity
EPICENTER - the point on the earth's surface vertically above the focus of an earthquake.
SEIMOLOGY - the branch of science concerned with earthquakes
SIESMOGRAPH - an instrument that measures and records details of earthquakes
MAGNITUDE - the great size or extent of something
INTENSITY - the measurable amount of a property
TSUNAMI - a long high sea wave caused by an earthquake
SEISMIC GAP - a segment of an active fault known to produce significant earthquakes