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5-2 Measuring Earthquakes

Learn about seismic waves, focus, epicenter, faults, and types of waves (P, S, surface) caused by earthquakes. Discover how seismographs record ground movement from seismic waves.

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5-2 Measuring Earthquakes

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  1. 5-2 Measuring Earthquakes

  2. Seismic waves- vibrations that travel through Earth carrying energy

  3. Focus- point beneath Earth’s crust where rock breaks, triggering an earthquake Epicenter- point on surface directly above the focus

  4. Fault Epicenter Focus Fault

  5. Types of Seismic Waves • P waves • S waves • Surface waves

  6. 1. P wave- primary wave, waves that compress and expand http://www.pbs.org/wnet/savageearth/earthquakes/index.html Types of waves

  7. 2. S wave- secondary wave, waves that vibrate up and down as well as side to side http://www.pbs.org/wnet/savageearth/earthquakes/index.html Types of waves

  8. 3.Surface wave- waves that make the ground shake http://www.pbs.org/wnet/savageearth/earthquakes/index.html Types of waves

  9. Seismograph- records ground movement caused by seismic waves

  10. http://www.nationalgeographic.com/forcesofnature/interactive/index.html?section=ehttp://www.nationalgeographic.com/forcesofnature/interactive/index.html?section=e

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