| A | B |
|---|
| fault | A fracture in Earth's lithosphere along which blocks of rock move past each other. |
| stress | The force applied by an object pressing on, pulling on, or pushing against another object. |
| earthquake | A shaking of the ground caused by the sudden movement of large blocks of rocks along a fault. |
| seismic wave | The vibrations caused by an earthquake. |
| focus | In an earthquake, the point underground where the rocks first begin to move. |
| epicenter | The point on Earth's surface directly above the focus of an earthquake. |
| seismograph | An instrument that constantly records ground movements. |
| aftershock | A smaller earthquake that follows a more powerful earthquake in the same area. |
| liquefaction | A process in which shaking in the ground causes loose, wet soil to act as a liquid. |
| tsunami | a large water wave caused by an earthquake, volcanic eruption, or landslide. |
