earthquakes

2. Push-pull (compressional) motion
5. Places in a fault zone that haven’t had a major earthquake recently
6. The study of prehistoric earthquakes
9. Ground shaking of Earth produced by the rapid release of energy along faults
11. Study of earthquake waves
16. The zone of greatest seismic activity that affects countries around the Pacific
18. A measure of earthquakes based on the amount of damage
22. An event or change that precedes an earthquake and may provide a warning
23. A place of strong seismic activity from the Mediterranean to the Himalayas

1. Complex motion
3. The plate boundary separating a slab of oceanic plate and overlying plate
4. Point on Earth’s surface directly above the hypocenter
7. Earthquakes of lesser magnitude preceding the major earthquake
8. Earthquake recording instrument
10. A measure of the magnitude of an earthquake based on the largest seismic wave
12. When soils and other materials containing a lot of water turn into a fluid-like mass
13. Displacement along a fault that is so gradual that little seismic activity occurs
14. Measures total energy released
15. Location where slippage begins
17. A break in rock mass along which movement has occurred
19. Composed on an iron-nickel alloy
20. Behaves like a solid due to extreme pressure
21. Large wave generated from displacement of the ocean floor
23. Earthquakes of lesser magnitude occurring after the major earthquake