2. 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

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

4. 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

5. How S and P waves travel

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

7.  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