| A | B |
|---|
| Earthquake | A release of built-up energy in the crust (at plate boundaries). |
| Focus (focal point) | Exact spot of the earthquake in the ground |
| Epicenter | – Location on the surface of the Earth directly above the focus an earthquake. |
| S-wave (secondary wave, shear wave) | Earthquake wave that can only travel through solids, looks wavy, is slower than a P-wave and causes the most damage. |
| P-wave (primary wave, "push-pull wave, compression wave) | – Earthquake wave that can travel through solids and liquids and is faster than S-waves. |
| Richter Scale | A scale that measures an earthquakes magnitude (amount of energy released). Ranges from 0-10. Each increase of 1 means a 10 times increase in shaking. |
| Mercalli | A scale that measures an earthquakes intensity Ranges from I to XII. This is measured from the effects on humans. |
| Seismic | Another word for Earthquake. |
| Tsunami | Large water waves triggered from an underwater earthquake |
| Shadow Zone | An area where S-waves can’t be detected (since they can’t go through the outer core). |
| Seismograph | An instrument used to measure earthquake waves. |
| Seismogram | The image produced from a seismograph |
| Interface | The boundary between two different earth zones |
| Origin Time | The exact time an earthquake occurs. |
