Earthquake Terminology

3. the sudden vertical or horizontal movement of rock masses along a fault
6. the zone where about 15% of all earthquakes occur
7. a weak earthquake
8. one of the most active earthquake zones
9. an instrument used to record and study earthquakes
11. Earthquake or tremor that often follows a larger earthquake
13. the scale that describes and evaluates an earthquake by its effects on people and buildings
14. the point on the earth's surface directly above an earthquake's hypocenter
17. a record produced by a seismograph
18. an earthquake that results from sudden movements of rock below the earth's surface

1. the fastest-traveling type of seismic wave
2. the theory that states rocks on either side of a fault will spring back to a position of little or no strain at the moment of an earthquake
4. earthquake-protection system that separates buildings from their foundations
5. the study of earthquakes
10. the most reliable method for measuring an earthquake's strength
12. seismic waves that arrive last and usually cause the most damage
15. the best-known earthquake magnitude scale
16. the point on a fault at which an earthquake begins