What causes an earthquake?  Deformation- the change in shape of rock in response to stress  Elastic Rebound- Return of rock to its original undeformed.

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Presentation transcript:

What causes an earthquake?  Deformation- the change in shape of rock in response to stress  Elastic Rebound- Return of rock to its original undeformed state

Are all earthquakes the same?  Convergent boundaries produce the strongest earthquakes

How do Earthquakes Travel?  Seismic waves- waves of energy that travel through the Earth l Body waves l P (Primary) waves-travel through solids, liquids, and gases, fastest traveling waves l S (Secondary) waves- 2nd fastest traveling, only go through solids

How S and P waves travel

Seismic Waves (cont.)  Surface Waves-cause the ground to move up and down as the wave travels along the surface, cause the most damage

 Seismograph- an instrument that records seismic waves  Epicenter- the place on earth’s surface directly above where earthquakes begin  Focus- the place beneath the earth’s surface where earthquakes begin  Richter Scale- measures earthquake strength

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