Seismic Waves

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Seismic Waves

  1. 1. Seismic Waves<br />Page 26<br />
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  4. 4. Types of Waves<br />P waves – Primary Waves<br /> Longitudinal<br /> Compression/Rarefaction<br />Speed: Faster<br />27<br />
  5. 5. Types of Waves<br />S waves – Shear Waves<br /> Transverse<br /> Crest/trough<br /> Can not pass through liquid<br />27<br />
  6. 6. Types of Waves<br />Surface waves – combination of P and S<br />Speed: Slow moving<br />28<br />
  7. 7. Types of Waves<br />Ocean waves – Tsunami<br />Size: Above normal by 2 cm to 30 meters<br />28<br />
  8. 8. Tsunami<br />Variables<br />Distance in two hours?<br /> Distance in four hours?<br />3. Easter Island is 3,700 miles away, time?<br />28<br />
  9. 9. Seismograph<br />Records ground movements<br />Measure S and P waves sense they arrive at different times<br />Need three points to determine the location<br />Can be used to locate underground resources<br />29<br />
  10. 10. Richter vs. Mercalli Scales<br />

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