Abstract
We propose a mechanical model for earthquakes which, unlike the well-known Burridge-Knopoff model, takes into account the transversal vibrations against the background of a longitudinal moving fault. It is shown that the energy of the moving earthquake fault may generate not only longitudinal but also vertical displacements of the ground. The mechanism of parametric instability resulting in stochastic transversal vibrations is responsible for this energy transfer. Numerical experiments show that the amplitudes of transversal and longitudinal vibrations have the same order of magnitude.
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