| Term | Definition |
|---|
| earthquake | the shaking and trembling that results from the sudden movements of part of the Earth's crust |
| tsunami | a giant sea wave produced by an earthquake |
| focus | the underground point of origin of an earthquake, where the rocks break and move |
| epicenter | the point on the earth's surface directly above the focus of an earthquake |
| seismic waves | an earthquake wave |
| primary wave | a push-pull seismic wave, which can travel through solid, liquid and gases, fastest |
| secondary wave | a side to side earthquake wave, which can travel through solids but not through liquids or gases; slower than P waves but faster than L waves |
| surface wave | an up and down earthquake wave; Slowest moving seismic wave |
| seismograph | an instrument that detects and measures seismic waves |
| seismologist | a scientist who studies earthquakes |
| seismogram | a record of seismic waves recorded by a seismograph |
| Richter scale | the scale used to measure the strength of earthquakes, (1-10) |
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