Earthquakes

5. fault horizontal and vertical movement that causes the crust to move further apart
6. sudden and violent shaking of the ground caused by fault movement
8. stress that decreases the volume of material
10. a record of the earthquake
14. scale that is determined by the height or amplitude of seismic waves
15. rates earthquakes with Roman numerals
17. where the earthquake begins on the surface
18. where earthquakes begin below the surface
19. the slow, perpendicular waves compared to the direction of movement
20. the squeeze and pull of rocks in the direction of the wave

1. the size of something
2. total force acting on crustal rocks per unit
3. deformation is the response when there is to low stress, will return to normal
4. stresses the material apart
7. fault horizontal and vertical compression that squeezes and shorten the crust
9. deformation is the response when there is high stress, will not return to normal
11. ground moves in every direction causing the most destruction
12. stress that causes material to twist
13. a machine that has a frame anchored to the ground and a suspended mass that makes recordings during an earthquake
16. fault horizontal shear stress in a separate direction