| A | B |
|---|
| normal fault | fault formed from tension |
| strike-slip fault | fault formed from shearing |
| focus | where the waves begin, usually below the surface |
| epicenter | the point on Earth’s surface directly above the focus |
| surface wave | slowest wave, produces the most damage |
| shadow zone | area where no P-Waves appear |
| seismograph | instrument that records seismic waves |
| magnitude | measures the energy of the seismic waves |
| seismogram | a record produced by a seismometer that helps track the seismic waves |
| reverse fault | fault formed from compression |
| fault | a fracture or system of fractures along Earth |
| stress | the force that builds up on rocks in the Earth's crust |
| compression | rock squeezed together |
| tension | rock pulled apart |
| shearing | plates rub against each other |
| P-Waves | fastest waves |
| S-Waves | second fastest waves |
| Richter Scale | measures the energy of the largest seismic waves produced during the quake |
| pancaking | the walls of the ground floor shakes causing the upper floors to fall on top of it |
| tsunami | a large ocean wave generated by vertical motions of the sea floor |
