| A | B |
|---|
| seismograph | an instrument that records vibrations in the ground and determines the location and strength of an earthquake |
| seismogram | a tracing of earthquake motion that is created by a seismograph |
| epicenter | the point on earth's surface directly above the earthquake's starting point, or focus |
| focus | the point along a fault at which the first motion of an earthquake occurs |
| richter scale | measures the ground motion from an earthquake and adjusts for distance to find its strength |
| magnitude | a measure of the strength of an earthquake |
| mercalli scale | measures the observable effects & damage of the earthquake |
| amplitude | the height of a wave |
| s-p interval | the amount of time that the p wave beats the s wave |
