10.4 STUDYING EARTH

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CHAPTER 10

• 10.4 STUDYING EARTHS INTERIOR

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THE SHADOW ZONE

• SEISMIC WAVES CAN BE USED TO IDENTIFY THE LAYERS
  OF THE EARTH
• P AND S WAVE VELOCITIES INCREASE THROUGH SOLIDS
  AND DECREASE THROUGH LIQUIDS
• BECAUSE P WAVES ARE REFRACTED (BENT), THEY ARE
  NOT RECORDED IN THE SHADOW ZONE. S-WAVES ARE NOT
  EITHER BECAUSE THEY CANNOT PASS THROUGH LIQUIDS

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THE MOHO

• BOUNDARY WHERE DENSE ROCK OF MANTLE MEETS LESS
  DENSE ROCK OF THE CRUST
• DENSER ROCK CAUSES P AND S WAVES TO SPEED UP IN
  MANTLE
• 32 KM UNDER CONTINENTS 5-10 KM BELOW OCEAN

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THE TRANSITION ZONE

• SEPERATES THE UPPER MANTLE FROM LOWER MANTLE
• P AND S WAVES SPEED UP AT THIS POINT
• MANTLE SAME MATERIAL THROUGHOUT, BUT LOWER MANTLE
  IS UNDER MORE PRESSURE AND IS THEREFORE MORE DENSE