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Earthquakes An earthquake is the shaking or trembling of the earth caused by the _Sudden_ movement of the earth’s crust. They usually occur where rocks that have been fractured suddenly _Shift___. Most earthquakes occur along _Plate Boundaries_______ Elastic Rebound Theory Lithospheric rocks are “locked” which causes great _Stress___. This causes the rocks to _Fracture__ and the two sides of the rock “spring out and back” _Slippage__ causes a release in energy in the form of vibrations called: _Seismic Waves__. When seismic waves cause other rocks to move (or the same rocks move again) it is called: AN AFTERSHOCK The place along a fault where the rock moves is called the: THE FOCUS The earthquake is usually felt the strongest on the surface above the focus called the __Epicenter__ The process of using different locations to help pin point the epicenter is called Triangulation 3 different earthquake depths 1. Shallow focus: within 70 km of earth’s surface. 2. Intermediate focus: between 70km – 300km 3. Deep Focus: Occurs in subduction zones between 300-650km. Which depth causes the most damage? Why?