| A | B |
|---|
| aftershock | a less powerful shock following the principal shock of an earthquake |
| earthquake | a shaking or movement of Earth's surface, caused by the release of stored energy along a fault |
| epicenter | the point on Earth's surface directly above an earthquake's point of origin, or focus |
| fault | a break in rock along which rock slabs have moved |
| focus | the point, or place, at which an earthquake begins |
| magnitude | the force or strength of an earthquake |
| Richter scale | a scale of numbers by which the magnitude of earthquakes is measured |
| seismograph | an instrument that records the intensity, duration, and nature of earthquake waves |
| tsunami | a huge, powerful ocean wave usually caused by an underwater earthquake |
