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...Lecture notes bill engstrom instructor earthquakes glg physical geology now that we ve seen what faults are and how mountains built can look at happens when there is movement along those which active today the first thing need to find out an earthquake observe movements produce usually associated with large fractures in earth s crust called most of motion be explained by plate tectonics theory caused magma explosions e g volcanoes or nuclear bombs elastic rebound appears primary mechanism during process slippage weakest point focus occurs after buildup strain vibrations occur as deformed rock springs back its original shape then entire repeated builds up again often existing whenever frictional forces on fault surfaces overcome so exactly vibration produced rapid release energy released radiates all directions from source see below form waves sensitive instruments around world record event where do originate remember these definitions also known hypocenter it place within epicenter loc...