| A | B |
|---|
| aftershock | series of smaller earthqukes that follow a large earthquake |
| body waves | wave that travel from the focus of an earthquake |
| earthquake | shaking Earth's crust caused by a release of energy |
| epicenter | point on Earth's surface directly above first movement |
| fault | break in lithosphere along which movement has occurred |
| focus | point where first movement of an earthquake occurred |
| liquefaction | loose soil in an earthquake takes on the properties of a liquid |
| love wave | surface wave with particles moving in an elliptical pattern (up/down side/side) |
| magnitude | strength measurement of earthquake's force/energy |
| P waves | compressional/primary waves that squeeze and stretch rock |
| Rayleigh wave | surface wave where particles move perpendicular to wave directions (up/down) |
| S waves | shear/secondary waves rock moves perpendicular to wave direction |
| seismic gap | area along a fault that has not moved over a period of time |
| seismogram | recordsheet placed on drum of seismograph machine to record waves |
| seismograph | intrument that detects and records waves produced by earthquakes |
| shadow zone | wide belt opposite from focus where P waves are absent due to refraction by core |
| surface wave | earthquake waves hat travel along Earth's surface |
| tsunami | huge ocean waves caused by underwater earthquakes and lansides |
