earthquake - sudden ground movement caused by the release of stored energy in rocks, focus - the point where the rock ruptures to cause a quake, epicenter - the point above the focus (on earth's surface) where a quake occurs, plate boundaries - boundary between two plates where earthquakes occur, fault - crack in earth's crust that causes an earthquake, seismogram - a graphical record of P and S waves in an earthquake, seismograph - an instrument that records seismic waves, P-waves - primary waves that arrive first at a seismic station, S-waves - Secondary waves that arrive later at a seismic station, Squiggle - the shape of a seismic wave recorded on a seismogram,

Earthquakes

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