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28 Multiple choice questions

  1. The transformation of seemingly solid sediment into a liquid-like slurry, in response to ground shaking.
  2. The record of an earthquake produced by a seismograph.
  3. Seismic waves in which particles of material move back and forth perpendicular to the direction in which the wave itself moves.
  4. The point on the surface of the Earth directly above the focus of an earthquake.
  5. 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.
  6. Seismic waves that pass through the interior of the Earth.
  7. The relatively narrow strips of crust on Earth under which most earthquakes occur.
  8. The point below the Earth's surface where the energy is produced during an earthquake.
  9. The amount of movement or slip across a fault plane.
  10. The series of smaller earthquakes that follow a major earthquake.
  11. A fracture on which one body of rock slides past another.
  12. Earthquake that occurs away from plate boundaries.
  13. A sloping band of seismicity defined by intermediate- and deep-focus earthquakes that occur in the down-going slab of a convergent plate boundary.
  14. The series of smaller earthquakes that precede a major earthquake.
  15. Stop-start movement along a fault plane caused by friction, which prevents movement until stress builds up sufficiently.
  16. Waves of energy emitted at the focus of an earthquake.
  17. 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.
  18. An earthquake characterization scale based on the amount of damage that the earthquake causes.
  19. Any numerical representation of the size of an earthquake as determined by measuring the amplitude of ground motion.
  20. A vibration caused by the sudden breaking or frictional sliding of rock in the Earth.
  21. A scale that defines earthquakes on the basis of the amplitude of the largest ground motion recorded on a seismogram.
  22. An instrument that can record the ground motion from an earthquake.
  23. Earthquake activity.
  24. A small step on the ground surface where one side of a fault has moved vertically with respect to the other.
  25. Waves in which particles of material move back and forth parallel to the direction in which the wave itself moves.
  26. Seismic waves that travel along the Earth's surface.
  27. A large wave along the sea surface triggered by an earthquake or large submarine slump.
  28. The average time between successive geologic events.