| A | B |
|---|
| Earthquake | A violent shaking of movement that occurs in the earth |
| Focus | the exact place in the earth where the earthquake took place |
| Epicenter | the point on the earth directly above the focus |
| Seismology | the study of seismic activity |
| Seismologist | the scientist who studies earthquakes |
| Seismic Waves | the shock waves produced by earthquakes |
| Primary Longitudinal Waves | Primary first and fastest waves or compression waves squished together |
| Secondary Transverse Waves | Set of forces or waves slower |
| Surface/Love Waves | a combination of both P + S waves effects, causes most of the damage |
| Lag Time | time difference in arrival between the P + S waves |
| Magnitude | measures the strength, size and amount of energy released by the earthquake (measured on Richter scale) |
| Intensity | measures the effects, what is seen or felt by the earthquake |
| Richter Scale | used to measure magnitude or strength of an earthquake (1-9) |
| Mercalli Scale | used to measure intensity or the effects of an earthquake (I-XII) |
| Shadow Zone | zone or area where the effects of an earthquake are not noticed or felt |
| Triangulation | technique using 3 locations or seismic stations to pinpoint an earthquake |
