| A | B |
|---|
| seismology | study of earthquakes |
| elastic rebound | sudden return of deformed rock to its original shape |
| deformation | change in rock shape due to stress |
| seismic waves | energy that travels through Earth's interior |
| P wave | primary or pressure wave |
| S wave | secondary or sheer wave |
| surface waves | waves which travel slowly and are very destructive |
| seismogram | tracing of earthquake motion |
| epicenter | point on Earth's surface directly above the earthquake's starting point |
| focus | point along the fault where the earthquake begins |
| gap hypothesis | idea that areas with many earthquakes have weaker earthquakes |
| seismic gap | area along a fault where few earthquakes have happened |
