Earthquakes

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Across
  1. 3. waves produced by earthquakes
  2. 6. the original magnitude scale
  3. 8. the magnitude scale that was based on the Richter scale.
  4. 9. the boundary where most earthquakes occur
  5. 11. the first wave to arrive at a seismograph
  6. 12. the area underground where seismic waves start
  7. 13. the area on the surface directly above a focus
  8. 14. a break in the crust
Down
  1. 1. the outermost layer of earth
  2. 2. the boundary where the least amount of earthquakes occur
  3. 4. the scale that uses no instruments, only observations of damage.
  4. 5. the slowest seismic wave
  5. 7. shaking of the ground caused by plate movement
  6. 10. the second wave to arrive at a seismograph