They transmit energy through the earth in all directions from the earthquake’s focus-the place underground where the temblor began.ģ. S waves and P waves are known as body waves. S waves that behave in this manner are called horizontal S waves or SH waves. In this case, sections of the Slinky will move horizontally-but, as above, the movement of the Slinky is at right angles to the direction of the progressing wave. You can also shake the Slinky from side to side. (S waves can’t travel through liquid or gas.) More specifically, this models SV waves-S waves in which the vibratory motion is vertical. It provides a model for S waves, the secondary seismic waves that travel through solid rock. This type of wave is called a transverse wave. This time, sections of the Slinky move up and down, perpendicular to the direction in which the wave is traveling. They’re known as primary waves because they’re the fastest of the earthquake waves, arriving first at distant points.Ģ. This type of wave is called a longitudinal wave, or a compression wave, and it’s a model for seismic primary waves, or P waves. The vibrating parts of the Slinky move back and forth in the same direction as the wave is traveling. Notice thatĪ wave travels along the Slinky from you to your partner. Pull the Slinky toward you a bit and then push it away. Or, tie one end of the Slinky to a chair or other solid objectġ. Stretch the Slinky 6 feet (2 meters) or more between your partner and Of P and S waves and the motion of Rayleigh and Love waves. You can also see illustrations of the motion Waves may send you rocking and rolling, and which ones may bounce youīefore this activity, you may want to read about waves A Slinky makes a handy model of earthquake waves.
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