Seismic Waves

7. Waves that travel along the Earth's surface.
8. A measure of the size of an earthquake, often measured by the Richter scale.
9. Waves that cause horizontal ground shaking.
10. Waves that cause a rolling motion on the ground.
12. A vibration from underground movement along a fault plane.
14. An instrument that measures and records ground movements.
15. Shear waves that travel slower than P-waves and cannot travel through liquids.
16. A fracture in the Earth's crust where movement has occurred.
17. The maximum displacement of a wave from its resting position.

1. The point on the Earth's surface directly above the focus.
2. Seismic waves that travel through the interior of the Earth.
3. A large ocean wave caused by an earthquake, volcanic eruption, or landslide.
4. The highest point of a wave.
5. The distance between two consecutive wave crests or troughs.
6. Longitudinal waves that can travel through solids, liquids, and gases.
11. An elastic wave generated by an impulse such as an earthquake or an explosion.
13. The lowest point of a wave.
16. The point within the Earth where an earthquake rupture begins.