| A | B |
|---|
| fault creep | the slow, almost continuous movement of rock along a fault |
| focus | the point inside the earth where an earthquake begins |
| seismograph | an instrument that measures and records earthquake waves |
| normal fault | a fault in which the hanging wall slides down the footwall |
| P waves | seismic body waves that travel through solids, liquids, and gases and that are detected first |
| strike-slip fault | a fault in which two fault blocks move past each other horizontally |
| Rayleigh waves | seismic surface waves that are detected last and move through the earth in an elliptical pattern |
| magnitude | a measurement of the strength of an earthquake |
| S waves | seismic body waves that travel through solids, and moves perpendicular to the direction of travel. Causes more damage. |
| Love waves | seismic surface waves that are fast and move through the earth in a side to side pattern. |
