| A | B |
|---|
| earthquake | Shaking or movement of plates. |
| deformation | ANy change in the wolume or shape of Earth's crust |
| shearing | Stress that pushes a mass in two opposite directions. |
| tension | Stress stretches the Earth's crust. |
| fault | A break in the Earth's surface. |
| focus | The point beneath Earth's surface where the EQ begins. |
| epicenter | he point on the surface directly above the focus. |
| seismic waves | Vibrations that travel through the Earth carrying the energy of an EQ |
| P wave | The fastest seismic wave |
| S waves | A wave that moves side to side |
| surface waves | Seismic waves that travel close to the surface of the Earth. |
| tsunamis | A large wave caused by a EQ. |
| aftershock | An EQ that occurs after a larger EQ in the same area. |
| liquefaction | The turning of loose, soft soil into liquid mud. |
| strike-slip fault | A fault where the plates slip past each other. |
| normal fault | A fault caused by tension. |
| seismograph | An instrument that records the ground movements caused by seismic waves. |
| Mercalli scale | Scale used to rank an EQ's intensity. |
| Richter scale | Scale used to rank an EQ's size of seismic waves |
| triangulation | The use of three distances to find the epicenter of an EQ. |
