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Inside Earth Ch.2:2
Measuring Earthquakes
| Question | Answer |
|---|---|
| The point beneath Earth’s surface where rock breaks under stress and causes an earthquake. | focus |
| Point on the Earth’s surface directly above the earthquake’s focus. | epicenter |
| Vibrations that travel through the earth carrying the energy released during an earthquake. | seismic waves |
| A type of seismic wave that compresses and expands the ground. It is the fastest seismic wave. | P-Wave |
| A type of seismic wave that moves the ground up and down or side to side. S-waves are slower than P-waves and cannot travel through a liquid. | S-Wave |
| Type of seismic wave that forms when P and S waves reach Earth’s surface. Causes the most damage. | surface wave |
| A machine that records ground movements caused by seismic waves as they move through the Earth. | seismograph |
| Measurement of earthquake strength based on seismic waves and movement along faults. | magnitude |
| A scale that rates earthquakes according to how much damage they cause at a particular place. | Mercalli scale |
| Scale for measuring earthquakes, Each step in scale is 10 times more powerful than the step below. | Richter scale |
| A rating system that estimates the total energy released by an earthquake. Used today. | moment magnitude scale |
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huffakerluk11
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