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Chapter 5 Earthquakes
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Chap 5, Sec 2 (Measuring Earthquakes)
Objectives: How does the energy of an earthquake travel through Earth? What are the different kinds of seismic waves? What are the scales used to measure the strength of an earthquake?
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Tech Terms: focus – the point beneath Earth’s surface where the earthquake occurs (rock under stress breaks). epicenter – the point that is on the surface, directly above the focus.
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seismic waves – vibrations that travel through Earth, carrying the energy released during an earthquake. P waves – PRIMARY…these arrive first (movement is like an accordion).
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S waves – SECONDARY…these arrive second (vibrate side to side and up and down).
seismograph – an instrument used by geologists to measure the vibrations of seismic waves. magnitude – a number given to the relative size of an earthquake
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