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  1. fault
  2. Mercalli intensity scale
  3. hypocenter
  4. recurrence interval
  5. elastic-rebound theory
  6. Richter scale
  7. Magnitude
  8. Foreshocks
  9. compressional waves
  10. fault scarp
  11. Wadati-Benioff zone
  12. intraplate earthquake
  13. aftershocks
  14. Seismicity
  15. seismic belt
  16. moment-magnitude scale
  17. Seismogram
  18. Liquefaction
  19. surface waves
  20. shear waves
  21. epicenter
  22. Seismograph
  23. Tsunami
  24. earthquake
  25. stick-slip behavior
  26. body waves
  27. Displacement
  28. seismic waves
  1. a A sloping band of seismicity defined by intermediate- and deep-focus earthquakes that occur in the down-going slab of a convergent plate boundary.
  2. b A vibration caused by the sudden breaking or frictional sliding of rock in the Earth.
  3. c A small step on the ground surface where one side of a fault has moved vertically with respect to the other.
  4. d An instrument that can record the ground motion from an earthquake.
  5. e Seismic waves that pass through the interior of the Earth.
  6. f The amount of movement or slip across a fault plane.
  7. g Seismic waves that travel along the Earth's surface.
  8. h The point on the surface of the Earth directly above the focus of an earthquake.
  9. i Any numerical representation of the size of an earthquake as determined by measuring the amplitude of ground motion.
  10. j An earthquake characterization scale based on the amount of damage that the earthquake causes.
  11. k A scale that defines earthquakes on the basis of the amplitude of the largest ground motion recorded on a seismogram.
  12. l Waves of energy emitted at the focus of an earthquake.
  13. m The record of an earthquake produced by a seismograph.
  14. n A numerical representation of the size of an earthquake that takes into account the area of the fault that slipped, the amount of slip, and the strength of the rock that broke.
  15. o Earthquake that occurs away from plate boundaries.
  16. p The series of smaller earthquakes that follow a major earthquake.
  17. q Stop-start movement along a fault plane caused by friction, which prevents movement until stress builds up sufficiently.
  18. r The point below the Earth's surface where the energy is produced during an earthquake.
  19. s A large wave along the sea surface triggered by an earthquake or large submarine slump.
  20. t The series of smaller earthquakes that precede a major earthquake.
  21. u Waves in which particles of material move back and forth parallel to the direction in which the wave itself moves.
  22. v Earthquake activity.
  23. w The concept that earthquakes occur when rock elastically bends until it fractures; the fracturing generates earthquake energy and decreases the elastic energy stored in the rock.
  24. x The relatively narrow strips of crust on Earth under which most earthquakes occur.
  25. y A fracture on which one body of rock slides past another.
  26. z The transformation of seemingly solid sediment into a liquid-like slurry, in response to ground shaking.
  27. aa The average time between successive geologic events.
  28. ab Seismic waves in which particles of material move back and forth perpendicular to the direction in which the wave itself moves.