| A | B |
|---|
| Earthquake | the shaking and trembling of the Earth's crust |
| Shearing | a stress force that pushes rock in opposite directions |
| Tension | a stres force that stretches rock |
| Compression | a stress force that squeezes rock |
| Fault | a break in the earth's crust |
| Strike-Slip Fault | a fault in which rock moves side to side |
| Normal Fault | a fault in which land forms are pulled apart |
| Reverse Fault | a fault in which land forms are pushed together |
| Focus | the point beneath the Earth's surface where an earthquake starts |
| Epicenter | the point on the Earth directly above the focus |
| P-Waves | waves that compress and expand the ground |
| S-Waves | waves that vibrate side to side |
| Seismic Waves | earthquake vibrations |
| Seismograph | an instrument that records ground movements caused by seismic waves |
| Magnitude | the measurement of an earthquake's strength along a fault |
| Mercalli Scale | scale which measures an earthquakes intensity and amount of damage |
| Richter Scale | a scale which measures seismic waves measured by a mechanical seismograph |
| Moment Magnitude Scale | a scale which measures the total energy released by any earthquake |
| Plateau | a large area of elevated flat land |
| Footwall | the bottom half of a fault |
| Hanging wall | the top half of a fault |
