Earth Structure and Earthquake Waves

• What is a discontinuity?


  Where the properties properties of the earth significantly change
• What are the 3 types of discontinuity?

  1. Moho
  2. Gutenburg
  3. Lehmann
• What is a Moho?


  Crust/Mantle Boundry, the chemical composition and density change
• gutenburg


  Mantle and outer core density change, stony to metallic composition
• Lehmann

  Outer core and inner core, liquid -> solid
• What do Geologists gather data from?

  1. Earthquakes
  2. Magnetism
  3. Meteorites
  4. Thermal Energy
  5. Gravity Anomalies
• Earthquakes make waves, they travel through the Earth and across its surface
• Waves change speed and direction as they go through the Earth's layers.