The oscillon is a highly localized dynamical phenomena occurring in a thin horizontal layer of granular material, which rests on a rigid metal plate and the plate oscillates in the vertical direction. It is axially symmetric and physically resembles a splash of liquid due to a falling drop, except that it continually perpetuates itself and does not generate a spreading wave, as is he case for a liquid splash. If the plate vibrates with amplitude A and period T=2π/ω, then the oscillonmoves from "peak" to "crater" in time T_1 and "crater" to "peak" time T_2, such that the time from "peak" to "peak" or "crater" to "crater" is twice the period of the oscillating plate namely T_1＋T_2=2T.
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