Translations:Polarity/4/en

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A seismic wave represents an interchange between kinetic and potential energy. The kinetic energy comes from the physical motion of the particles, and the potential energy comes from their relative positions with respect to the interparticle elastic (or restoring) forces. The rest position of each particle can be taken as the origin of a 3D coordinate system. The particle vibrates around this rest position. At any instant, we can measure in principle the particle’s velocity and, if we wish, the particle’s acceleration. We also can measure the degree of compression of the particles in the form of a pressure or stress.