Earthquake terminology

3. The strength of an earthquake
5. Where two plates diverge
7. The centre position of the Earth from where seismic waves start.
8. The earthquakes that arrive before larger earthquakes in a similar place.
10. It is the position on the Earth’s surface vertically above the focus of an earthquake. This position is expressed by its geographical latitude and longitude.
13. The largest earthquake.
14. The scale used to measure the magnitude of an earthquake
17. Can measure the strength and duration of the earthquake’s waves. It is a primary earthquake recording device.

1. An area of fractures between two masses of rock.
2. Currents in the mantle responsible for plate movement
4. The earthquakes arrived after the largest shock of an earthquake series.
6. Where two plates converge
9. waves Waves of energy that move through the Earth’s layers.
11. Secondary effect of earthquakes
12. These waves reach the surface first
15. Tectonic plates move past each other.
16. The inner component of the seismograph, which may be a pendulum, or a mass attached to a spring.