Translations:Introduction - Chapter 1/9/en

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Seismic waves travel through the rock layers of the earth. A source of energy makes an initial rock particle oscillate around its equilibrium position. This oscillation begins to push and pull on the second particle so that it oscillates about its equilibrium position. In this way, the energy is transferred from the first particle to the second particle. In turn, the oscillation of the second particle causes the third rock particle to oscillate around its equilibrium position. Again, the energy transfer occurs. This process continues consecutively. Each individual particle acts to displace the adjacent particle so that it too begins to oscillate. In this sequential manner, a disturbance travels through the medium and thereby transports kinetic energy.