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7GrInEarCh2 Sec. 2
7th Grade Inside Earth Chapter 2 Sec. 2
| Question | Answer |
|---|---|
| earthquake | the shaking and trembling that results from the movement of rock beneath Earth's surface |
| focus | the area beneath Earth's surface where rock that is under stress breaks triggering an earthquake |
| epicenter | the point on the surface directly above the focus |
| P waves | seismic waves that compress and expand the ground like an accordion |
| S waves | seismic waves that vibrate from side to side as well as up and down |
| surface waves | waves that move slower than P and S waves but produce severe ground movements |
| Mercalli scale | a scale to rate earthquakes according to the level of damage at a given place |
| magnitude | a number geologists assign to an earthquake based its size |
| Richter scale | rating of an earthquake's magnitude based on the size of its seismic waves |
| seismograph | instrument that measures seismic waves |
| moment magnitude scale | rating system that estimates the total energy released by an earthquake |
| liquefaction | when the earthquake's violent shaking suddenly turns loose soft soil into liquid mud |
| aftershock | an earthquake that occurs after a larger earth quake in the same area |
| tsunami | a large wave caused by an earthquake |
| base isolated building | building designed to reduce the amount of energy that reaches the building during an earthquake |
Created by:
Karen Copanic
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