Earthquakes

2. Instrument used to record the amplitude and frequency of seismic waves.
4. Process where one tectonic plate is forced beneath another at a convergent boundary.
7. Fracture or crack in the Earth's crust where movement has occurred.
10. Measurement scale for the magnitude of earthquakes.
14. Measure of the energy released at the earthquake's source.
15. Type of plate boundary where tectonic plates move away from each other.
17. Force that opposes the relative motion of objects in contact along a fault.
18. Large ocean wave caused by underwater earthquakes or volcanic eruptions.
19. Map showing the distribution of ground shaking intensity following an earthquake.
20. Region where two tectonic plates meet and interact.

1. Study of earthquakes and seismic waves.
3. Seismic waves that travel along the Earth's surface and cause the most damage.
5. Instrument used to detect and record seismic waves.
6. Type of plate boundary where tectonic plates move towards each other.
8. Pertaining to the Earth's crust and the movement of its plates.
9. Zone of high seismic activity and volcanic eruptions encircling the Pacific Ocean.
11. Phenomenon where saturated soil temporarily loses strength during an earthquake.
12. Vibrations that travel through the Earth's crust during an earthquake.
13. Sudden shaking of the ground caused by the movement of tectonic plates.
16. Point on the Earth's surface directly above the focus of an earthquake.