| A | B |
|---|
| seismic waves | waves sent out in all directions from focus |
| focus | point inside the earth where energy is released |
| epicenter | point on Earth's surface directly above the focus |
| earthquakes | when stresses are release & rocks exceed their elastic limit |
| magnitude | measures the energy released by earthquake |
| normal fault | a fault formed due to the tension on rocks |
| reverse fault | fault due to compressional forces on rocks |
| transform fault | a fault due to the plates sliding past each other |
| primary waves-P | waves that move back & forth in same direction |
| secondary waves- S | waves that move up & down in a ropey fashion |
| surface wave-L | most destructive because of up/down & side to side motion |
| seismograph | instrument used to detect vibrations of earthquake |
| seismologist | scientist who study these waves |
| tsunami wave | large sea waves that usually accompany an earthquake at sea |
| faults | slippage of rocks along a fault plane |
| potential energy | stored energy |
| kinetic energy | moving or energy of motion due to release of rocks |
| Richter scale | earthquake scale due to the magnitude of earthquake |
| Mercalli | scale of personal observation of destructive force of earthquake |
